Words that start with O
Optical disk
An optical disk is a storage medium that uses laser technology to read...
Optical double star
An optical double star is a pair of stars that appear close together i...
Optical effects
Optical effects refer to visual phenomena that occur when light intera...
Optical fiber
Optical fiber is a type of communication technology that uses light to...
Optical fibre
Optical fibre is a type of glass or plastic fibre that carries light a...
Optical flint
Optical flint is a type of glass with a high refractive index ideal fo...
Optical glass
Optical glass is a type of glass that is specifically designed for opt...
Optical illusion
Optical illusion is a visual phenomenon that tricks the brain into per...
Optical isomer
An optical isomer is a type of molecule that has mirror-image symmetry...
Optical isomerism
Optical isomerism is a type of stereochemistry in which molecules are ...
Optical mark reading
Optical mark reading is a technology that reads and interprets data fr...
Optical maser
An optical maser is a device that produces a coherent and concentrated...
Optical microscope
An optical microscope is a device used to magnify small objects that a...
Optical mouse
An optical mouse is a computer pointing device that uses optical senso...
Optical path
The optical path refers to the distance light travels through a medium...
Optical printer
An optical printer is a device used in the film industry to create vis...
Optical pumping
Optical pumping is a process in which atoms are excited and aligned by...
Optical pyrometer
An optical pyrometer is a device that measures temperature from a dist...
Optical resonator
An optical resonator is a device that traps and amplifies light by ref...
Optical rotation
Optical rotation is the rotation of the plane of polarization of light...
Optical scanner
An optical scanner is a device that converts physical images or text i...
Optical scanning
Optical scanning is the process of converting printed text or images i...
Optical sound
Optical sound refers to the recording of sound optically onto a film s...
Optical soundtrack
An optical soundtrack is a sound recording technology that uses light ...
Optical tooling
Optical tooling involves using precise measurements and alignment tech...
Optical tweezers
Optical tweezers manipulate microscopic particles using focused laser ...
Optical wedge
An optical wedge refers to a piece of glass or other material that is ...
Optician
An optician is a healthcare professional who specializes in designing,...
Opticist
An opticist is someone who specializes in the study of optics, particu...
Optics
Optics is the study of light and its interactions with matter and inst...
Optimal
Optimal means the most favorable or advantageous situation for somethi...
Optimally
Optimally means achieving the best possible outcome by utilizing resou...
Optime
Optime means "excellent" or "best" with an emphasis on quality....
Optimism
Optimism is the belief that positive outcomes will prevail in any give...
Optimist
An optimist is someone who expects the best outcome in any situation....
Optimistic
Being hopeful and confident about the future....
Optimization
Optimization is the process of making something as efficient or effect...
Optimize
To optimize means to make the best or most effective use of resources....
Optimum
Optimum means the best or most favorable outcome or result....
Optimum population
Optimum population refers to the ideal number of individuals that can ...
Option
An option refers to a choice or decision that is available to be made ...
Option money
Option money is a payment made by the potential buyer to the seller fo...
Optional
Optional means something that is not mandatory or required....
Optionee
An optionee is a person granted the right to purchase stock at a speci...
Opto-
The prefix opto- refers to sight or vision....
Optoelectronics
Optoelectronics is the study and application of electronic devices tha...
Optometer
An optometer is a device used for measuring the power of lenses or the...
Optometrist
An optometrist is a healthcare professional who specializes in assessi...
Optometry
Optometry is the profession of examining eyes for vision problems and ...
Optophone
An optophone is a device that converts written text into audible signa...
Optotype
An optotype is a standardized symbol used in vision testing to measure...
Opulence
Opulence is characterized by luxuriousness or richness in surroundings...
Opulent
Opulent means luxuriously rich and extravagant....
Opuntia
Opuntia is a type of cactus that is commonly known as prickly pear....
Opus
Opus is a creative work or composition, especially in music or literat...
Opus anglicanum
Opus anglicanum refers to a type of English medieval embroidery known ...
Opus Dei
Opus Dei is a Catholic institution that emphasizes finding holiness in...
Opuscule
An opuscule is a small literary or musical work....
Opusculum
Opusculum refers to a small or treatise, often of an elegant or schola...
Oquassa
Oquassa is a term meaning "well water" in the Abenaki language....
Or
The meaning of a text is often conveyed through the author's choice of...
OR circuit
An OR circuit is a logic gate that outputs a high signal if any of its...
Or else
"Or else" is used to indicate the consequence of not complying with a ...
Or other
The term or other signifies the presence of additional options or poss...
Or so
The phrase "or so" signifies an approximate amount or quantity....
Or what
The meaning of the text is emphasized through the highlighted word....
Or whatever
The phrase or whatever is used to suggest a lack of specificity or imp...
Ora
Ora means "now" in Italian, highlighting the importance of living in t...
Ora et labora
Ora et labora means pray and work, emphasizing the importance of balan...
Ora pro nobis
"Ora pro nobis" means pray for us in Latin....
ORAC
ORAC, Oxygen Radical Absorbance Capacity, measures the antioxidant lev...
Orach
Orach is a type of leafy green vegetable with a nutty flavor that can ...
Orache
Orache is a type of edible plant often found growing wild in sandy or ...
Oracle
An oracle is a sacred source of wisdom and guidance....
Oracle bones
Oracle bones were ancient Chinese artifacts used for divination purpos...
Oracles
The meaning of oracles lies in their ability to communicate divine mes...
Oracular
The word "oracular" means relating to an oracle or prophecy....
Oracy
The meaning of oracy is the ability to effectively speak and communica...
Orad
Orad refers to what is said or spoken aloud or verbally communicated r...
Oradea
Oradea is a city in Romania that signifies historical significance a...
Oral
Oral communication is the exchange of information spoken between indiv...
Oral contraceptive
Oral contraceptives are medications taken by mouth to prevent pregnanc...
Oral eroticism
Oral eroticism refers to the stimulation of sexual pleasure through ac...
Oral herpes
Oral herpes is a common infection caused by the herpes simplex virus t...
Oral history
Oral history is the recording and documentation of personal experience...
Oral hygiene
Oral hygiene is the practice of maintaining clean teeth and gums to pr...
Oral hygienist
An oral hygienist is a dental professional who specializes in promotin...
Oral interpretation
Oral interpretation is the art of conveying the meaning and emotions o...
Oral Law
The Oral Law, also known as the Halakhah, refers to the interpretation...
Oral personality
The oral personality refers to individuals who excel in verbal communi...
Oral sex
Oral sex is a sexual activity involving stimulation of the genitals us...
Oral society
An oral society is one in which information is primarily passed down o...
Oral stage
The oral stage is the first psychosexual stage of development in Freud...
Oral surgery
Oral surgery involves surgical procedures performed on the mouth and j...
Oral tradition
Oral tradition is the passing down of stories and cultural practices t...
Oral-formulaic
Oral-formulaic refers to a tradition of repetitive language and phrase...
Orale
Orale means "okay" or "go ahead" in Spanish, often used to encourage s...
Oralism
Oralism is a method of education for deaf individuals that focuses on ...
Oralist
An oralist is someone who prioritizes spoken communication over writte...
Orality
Orality is the transmission of knowledge and stories orally rather t...
Orally
The term "orally" refers to spoken communication rather than written c...
Oran
Oran is a city in Algeria that is haunted by the plague death....
Orang
Orang means person in Malay....
Orange
The color orange represents energy, warmth, and creativity....
Orange blossom
Orange blossom symbolizes new beginnings and purity....
Orange chromide
Orange chromide is a type of cichlid fish known for its vibrant orange...
Orange flower oil
Orange flower oil is a fragrant essential oil derived from the blossom...
Orange flower water
Orange flower water is a distillation of bitter orange blossoms used i...
Orange Free State
Orange Free State was a former independent Boer republic in southern A...
Orange hawkweed
The meaning of orange hawkweed can be defined as a perennial plant wit...
Orange lily
The orange lily represents passion, warmth, and creativity in the lang...
Orange peel
Orange peel is the thick fragrant outer skin of an orange fruit....
Orange pekoe
Orange pekoe refers to a grade of black tea consisting of long, wiry w...
Orange roughy
Orange roughy is a type of deep-sea fish known for its longevity and s...
Orange rust
Orange rust is a plant disease caused by fungi that infects various cr...
Orange stick
An orange stick is a tool used for pushing back cuticles during a mani...
Orange-peel fungus
Orange-peel fungus is a type of mushroom that resembles orange skin wi...
Orange-tip
The meaning of orange-tip is a butterfly species with distinctive oran...
Orangeade
Orangeade is a refreshing beverage made from oranges, sugar, and water...
Orangeburg
Orangeburg is a town in South Carolina that gained notoriety for the t...
Orangeism
Orangeism is a Protestant religious and political movement in Northern...
Orangeman
Orangeman is a term used to describe a member of the Protestant Orange...
Orangeman's Day
Orangeman's Day celebrates Irish Protestant heritage and commemorates ...
Orangemen's Day
Orangemen's Day is a holiday in Northern Ireland that celebrates the P...
Orangery
An orangery is a building or enclosure for growing orange trees and ot...
Oranges
Oranges represent the vitamin-rich citrus fruit that is known for its ...
Orangevale
Orangevale is a rural community located in Northern California known f...
Orangeville
Orangeville is a charming town known for its vibrant community and bea...
Orangewood
Orangewood is a type of wood that comes from the orange tree, known fo...
Orangutan
The meaning of orangutan can be defined as a primate species native to...
Orangy
The meaning of orangy is a color resembling the fruit orange....
Oranian
Oranian refers to people or things associated with the ancient city of...
Orans
Orans refers to a posture of prayer with arms raised and palms facing ...
Orant
Orant means being in a posture of prayer with arms raised upwards....
Orarion
An orarion is a liturgical vestment that is worn over the left shoulde...
Orarium
Orarium is a schedule or list of specific times for prayer and religio...
Orate
To orate means to speak publicly in a formal and eloquent manner....
Orate fratres
Orate fratres means "pray, brothers" in Latin....
Oration
Oration is the art of delivering a formal speech to an audience eloque...
Orator
An orator is a skilled public speaker who delivers persuasive and enga...
Oratorian
Oratorian refers to a member of a religious congregation dedicated to ...
Oratorical
Oratorical means relating to the skill or eloquence of speaking effect...
Oratorio
An oratorio is a musical composition for orchestra, choir, and soloist...
Oratory
Oratory is the art of public speaking in a persuasive and eloquent man...
Oratrix
An oratrix is a female speaker or advocate who is skilled in public sp...
Orature
Orature is the spoken form of literature, passed down through generati...
Orb
An orb is a spherical object or shape....
Orb weaver
Orb weavers are a family of spiders known for their impressive webs an...
Orbicular
The orbicular shape of the object means it is round or circular in app...
Orbiculate
The meaning of orbiculate is round or disk-shaped, like a flat circle....
Orbison
Orbison was a renowned singer-songwriter known for his distinctive voi...
Orbit
An orbit refers to the curved path followed by an object as it moves a...
Orbital
The orbital refers to the path an object takes as it revolves around a...
Orbital angular momentum
Orbital angular momentum refers to the rotational motion of a particle...
Orbital index
Orbital index is a measurement that indicates the proportion of an ani...
Orbital quantum number
The orbital quantum number determines the shape of an electron's orbit...
Orbital sander
An orbital sander is a power tool used for sanding and smoothing surfa...
Orbital velocity
Orbital velocity is defined as the minimum velocity required for an ob...
Orbitale
The term orbitale refers to a region in an atom where an electron is m...
Orbiteer
An orbiteer is someone who travels in space....
Orbiter
An orbiter is a spacecraft that orbits around a celestial body....
Orbiting Astronomical Observatory
The Orbiting Astronomical Observatory is a telescope in space used for...
Orbiting Geophysical Observatory
The Orbiting Geophysical Observatory was a series of satellites launch...
Orbiting Solar Observatory
Orbiting Solar Observatory is a space mission designed to observe the ...
Orby
Orby is a term that refers to a celestial object that orbits around a ...
Orc
An orc is a mythical creature often portrayed as a savage and brutish ...
Orca
The orca, also known as the killer whale, is a highly intelligent mari...
Orcadian
Orcadian refers to something or someone connected to the Orkney Island...
Orcagna
Orcagna was an Italian painter, sculptor, and architect from the 14th ...
Orcein
Orcein is a reddish-brown dye derived from lichens and used for biolog...
Orch.
The orch. is shorthand for orchestra, typically referring to a group o...
Orchard
An orchard is a piece of land planted with fruit-bearing trees or shru...
Orchard bush
An orchard bush is a small tree or shrub cultivated for its fruit....
Orchard grass
Orchard grass refers to a type of grass commonly grown in orchards or ...
Orchard oriole
The orchard oriole is a small songbird known for its bright coloring a...
Orchard valve
An orchard valve is a type of mechanical device used to control the fl...
Orchardist
An orchardist is someone who cultivates fruit trees for a living....
Orchardman
An orchardman is someone who tends to and cares for an orchard....
Orchectomy
Orchiectomy is a surgical procedure to remove one or both testicles....
Orchestra
An orchestra is a large instrumental ensemble typically comprised of s...
Orchestral
Orchestral music is characterized by its large ensemble of musicians p...
Orchestrate
Orchestrate means to organize and coordinate a complex work or event....
Orchestration
Orchestration is the arrangement and coordination of different musical...
Orchestrina
An orchestrina is a small organ-like musical instrument that produces ...
Orchestrion
An orchestrion is a musical instrument that uses mechanical components...
Orchi-
The prefix orchi- refers to testes or testicles, derived from the Gree...
Orchid
An orchid is a type of flower with delicate petals that is often assoc...
Orchid family
The orchid family consists of diverse and exotic flowering plants priz...
Orchid tree
Orchid tree is a tree with vibrant orchid-like flowers, resembling the...
Orchidaceae
Orchidaceae is a diverse and widespread plant family known for its be...
Orchidaceous
Orchidaceous means resembling or characteristic of orchids....
Orchidectomy
Orchidectomy is the surgical removal of one or both testicles....
Orchido-
The meaning of orchido- can be described as relating to the orchid pla...
Orchidology
Orchidology is the study of orchids, focusing on their cultivation, cl...
Orchidotomy
Orchidotomy is a surgical procedure that involves the removal of one o...
Orchiectomy
Orchiectomy is a surgical procedure where the testicles are removed to...
Orchil
Orchil is a purple dye obtained from certain lichens, often used in th...
Orchis
The orchis is a type of flowering plant found in various parts of the ...
Orchitis
Orchitis is the inflammation of one or both testicles, typically cause...
Orchotomy
Orchotomy is the surgical procedure of cutting into the testes....
Orcinol
Orcinol is a compound that can be found in certain plants and is commo...
Orcus
Orcus is a figure from Roman mythology who rules the underworld and pu...
Orczy
Orczy is a Hungarian-born British author known for her adventurous his...
Ord.
Ord signifies a specific order or rank in a hierarchy or system....
Ordain
To ordain means to officially confer holy orders or appoint someone to...
Ordained
The word ordained means to be officially appointed or established for ...
Ordainee
An ordainee is a person who has been given authority by religious lead...
Ordeal
Ordeal is a trial or experience that is difficult, challenging, or gru...
Ordeal bean
An ordeal bean is a legume used in traditional African cooking that re...
Ordeal tree
An ordeal tree symbolizes a challenging experience or test that one mu...
Order
Order is essential for maintaining structure and organization in vario...
Order about
Order is the arrangement of elements in a structured and organized man...
Order arms
The command "order arms" signifies the act of placing a rifle in a des...
Order bill of lading
An order bill of lading signifies that the goods are to be delivered t...
Order in council
An order in council is a formal administrative decision made by the ex...
Order of Australia
The Order of Australia is a prestigious honor recognizing outstanding ...
Order of battle
An "order of battle" is a structured list of the military units and eq...
Order of business
The order of business refers to the sequence in which tasks or activit...
Order of Canada
The Order of Canada is a prestigious award recognizing outstanding ach...
Order of magnitude
Order of magnitude represents the scale of a value, typically expresse...
Order of Merit
The Order of Merit is a prestigious award given to individuals for exc...
Order of Military Merit
The Order of Military Merit is a prestigious recognition awarded to in...
Order of the day
The essential tasks or priorities that need to be addressed or focused...
Order of the day, the
The priority or focus of the current situation or time....
Order of the Garter
The Order of the Garter is the oldest and most prestigious British ord...
Order of the Thistle
Order of the Thistle is a prestigious knightly order in Scotland....
Order paper
Order paper is a document that lists items of business to be dealt wit...
Order port
Order port refers to the specific designated location in a network whe...
Order someone about
To order someone about means to command or direct them in a bossy or a...
Order-driven
Order-driven refers to a market structure where trading activity is pr...
Ordered
Ordered means to arrange systematically or according to a specific seq...
Ordered field
An ordered field is a set equipped with two operations, addition and m...
Ordered pair
An ordered pair is a mathematical concept representing a relationship ...
Ordered set
An ordered set is a collection of elements with a specific sequence or...
Ordering
Ordering by highlighting means arranging items or information in a spe...
Orderly
The meaning of orderly is characterized by organization and neatness....
Orderly marketing agreement
An orderly marketing agreement is a collaborative arrangement among pr...
Orderly officer
An orderly officer is responsible for maintaining order and discipline...
Orderly room
An orderly room signifies a space that is organized, tidy, and well-ma...
Orders
Orders are instructions given to someone to carry out a specific task ...
Ordinal
Ordinal refers to a position in a series or order, indicated by a rank...
Ordinal number
An ordinal number indicates the position or order of something in a se...
Ordinal numbers
Ordinal numbers indicate the order or position of an element in a sequ...
Ordinal scale
Ordinal scale is a type of measurement scale in which data is ordered ...
Ordinance
An ordinance is a law or regulation enacted by a local government....
Ordinand
An ordinand is a person preparing for ordination as a minister....
Ordinariate
An ordinariate is a canonical structure within the Roman Catholic Chur...
Ordinarily
Ordinarily means typically or usually in normal circumstances....
Ordinary
The ordinary refers to things that are common or usual in everyday lif...
Ordinary differential equation
An ordinary differential equation is a mathematical equation that re...
Ordinary grade
Ordinary income
Ordinary income refers to income derived from regular, day-to-day acti...
Ordinary jubilee
The ordinary jubilee celebrates regular moments of joy and gratitude i...
Ordinary lay
The ordinary lay by is a designated stopping area for vehicles on the ...
Ordinary level
Ordinary level refers to a standard level of difficulty in education w...
Ordinary life insurance
Ordinary life insurance is a basic type of coverage that provides a de...
Ordinary point
An ordinary point is a point within a function where the derivatives e...
Ordinary rating
The ordinary rating is a standard evaluation given based on average pe...
Ordinary ray
An ordinary ray is a type of light ray that follows Snell's Law when p...
Ordinary seaman
An ordinary seaman is a beginner-level position on a ship responsible ...
Ordinary share
Ordinary share represents a common type of stock that grants ownership...
Ordinary shares
Ordinary shares represent ownership in a company and entitle the share...
Ordinary stock
Ordinary stock represents ownership in a company with voting rights an...
Ordinary wave
An ordinary wave is a common and frequently occurring wave phenomenon ...
Ordinary-language philosophy
Ordinary-language philosophy focuses on analyzing everyday language as...
Ordinate
The ordinate in a Cartesian coordinate system represents the vertical ...
Ordination
The ordination is the process by which someone is appointed or consecr...
Ordn.
Ordin. abbreviates the word "ordinance" in legal contexts....
Ordnance
Ordinance refers to military weapons such as guns, bombs, and missiles...
Ordnance datum
Ordinance datum is a reference point used to measure heights and depth...
Ordnance Survey
Ordnance Survey is a mapping organization that produces maps, geograph...
Ordo
Ordo refers to a sequence or arrangement of elements in a particular o...
Ordóñez
Ordóñez is a Spanish surname that means son of Ordoño....
Ordonnance
An ordonnance is a French term for a prescription or medical order iss...
Ordos
Ordos is a region in Inner Mongolia known for its vast grasslands and ...
Ordovician
The Ordovician period was a geologic time period approximately 485 to ...
Ordure
Ordure refers to waste material or excrement....
Ordzhonikidze
Ordzhonikidze was a Bolshevik revolutionary who played a significant r...
Ore
Ore is a type of rock that contains valuable minerals or metals that c...
Ore bridge
An ore bridge is a structure built to transport mined ore across a riv...
Ore dressing
Ore dressing is the process of separating valuable minerals from the...
Ore hearth
An ore hearth is a furnace used for smelting metal ores to extract pur...
Ore Mountains
The Ore Mountains refer to a mountain range in Central Europe known fo...
Ore rotundo
Ore rotundo means resounding or powerful in Latin....
Ore tanker
An ore tanker is a ship designed specifically for transporting bulk qu...
Oread
An oread is a mountain nymph in Greek mythology....
Orebody
An orebody refers to a concentration of valuable minerals within a roc...
Örebro
Örebro is a city in Sweden known for its castle and rich history....
Orecchiette
Orecchiette is a type of pasta shaped like little ears....
Orectic
The orectic state refers to a strong desire or appetite for something....
Oreg.
Oreg. means to pray or beg earnestly or to entreat....
Oregano
Oregano is a herb known for its aromatic flavor used in various cuisin...
Oregon
Oregon is a beautiful state known for its diverse landscapes and outdo...
Oregon cedar
Oregon cedar is a type of tree commonly found in the Pacific Northwest...
Oregon City
Oregon City is a historical city located in Clackamas County, Oregon....
Oregon crab apple
Oregon crab apple is a type of wild apple native to the Pacific Nort...
Oregon fir
Oregon fir is a general term that refers to various species of fir tre...
Oregon grape
Oregon grape is a shrub with holly-like leaves and dark blue berries t...
Oregon myrtle
Oregon myrtle refers to a type of evergreen shrub native to the Pacifi...
Oregon pine
Oregon pine is a type of wood primarily used for construction and furn...