| orach | (noun) any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes | Synonyms: orache |
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| orache | (noun) any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes | Synonyms: orach |
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| oracle | (noun) a shrine where an oracular god is consulted | - |
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| (noun) a prophecy (usually obscure or allegorical) revealed by a priest or priestess; believed to be infallible | - |
| (noun) an authoritative person who divines the future | Synonyms: prophesier, prophet, seer, vaticinator |
| oral | (noun) an examination conducted by spoken communication | Synonyms: oral exam, oral examination, viva, viva voce |
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| orang | (noun) large long-armed ape of Borneo and Sumatra having arboreal habits | Synonyms: orangutan, orangutang, Pongo pygmaeus |
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| orange | (noun) orange color or pigment; any of a range of colors between red and yellow | Synonyms: orangeness |
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| (noun) round yellow to orange fruit of any of several citrus trees | - |
| (noun) any citrus tree bearing oranges | Synonyms: orange tree |
| (noun) any pigment producing the orange color | - |
| orangeade | (noun) sweetened beverage of diluted orange juice | - |
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| orangeness | (noun) orange color or pigment; any of a range of colors between red and yellow | Synonyms: orange |
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| orangery | (noun) a place where oranges are grown; a plantation of orange trees in warm climes or a greenhouse in cooler areas | - |
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| orangewood | (noun) fine-grained wood of an orange tree; used in fine woodwork | - |
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| orangutan | (noun) large long-armed ape of Borneo and Sumatra having arboreal habits | Synonyms: orang, orangutang, Pongo pygmaeus |
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| orangutang | (noun) large long-armed ape of Borneo and Sumatra having arboreal habits | Synonyms: orang, orangutan, Pongo pygmaeus |
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| oration | (noun) an instance of oratory | - |
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| orator | (noun) a person who delivers a speech or oration | Synonyms: public speaker, rhetorician, speechifier, speechmaker |
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| oratorio | (noun) a musical composition for voices and orchestra based on a religious text | Synonyms: cantata |
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| oratory | (noun) addressing an audience formally (usually a long and rhetorical address and often pompous) | - |
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| orb | (noun) the ball-shaped capsule containing the vertebrate eye | Synonyms: eyeball |
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| (noun) an object with a spherical shape | Synonyms: ball, globe |
| orbit | (noun) an area in which something acts or operates or has power or control: | Synonyms: ambit, compass, range, reach, scope |
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| (noun) the bony cavity in the skull containing the eyeball | Synonyms: cranial orbit, eye socket, orbital cavity |
| (noun) the (usually elliptical) path described by one celestial body in its revolution about another | Synonyms: celestial orbit |
| (noun) the path of an electron around the nucleus of an atom | Synonyms: electron orbit |
| (noun) a particular environment or walk of life | Synonyms: area, arena, domain, field, sphere |
| orbitale | (noun) the craniometric point at the lowest point on the lower edge of the orbit | Synonyms: orbital point |
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| orbiter | (noun) man-made equipment that orbits around the earth or the moon | Synonyms: artificial satellite, satellite |
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| orca | (noun) predatory black-and-white toothed whale with large dorsal fin; common in cold seas | Synonyms: grampus, killer, killer whale, Orcinus orca, sea wolf |
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| orchard | (noun) garden consisting of a small cultivated wood without undergrowth | Synonyms: grove, plantation, woodlet |
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| orchestra | (noun) seating on the main floor in a theater | - |
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| (noun) a musical organization consisting of a group of instrumentalists including string players | - |
| orchestration | (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: instrumentation |
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| (noun) an arrangement of events that attempts to achieve a maximum effect | - |
| (noun) an arrangement of a piece of music for performance by an orchestra or band | - |
| orchestrator | (noun) an arranger who writes for orchestras | - |
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| orchid | (noun) any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors | Synonyms: orchidaceous plant |
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| orchidalgia | (noun) pain in the testes | - |
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| orchidectomy | (noun) surgical removal of one or both testicles | Synonyms: orchiectomy |
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| orchiectomy | (noun) surgical removal of one or both testicles | Synonyms: orchidectomy |
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| orchil | (noun) any of various lecanoras that yield the dye archil | Synonyms: archil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: archil, cudbear |
| orchiopexy | (noun) operation to bring an undescended testicle into the scrotum | - |
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| orchis | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, bollock, egg, nut, testicle, testis |
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| (noun) any of various deciduous terrestrial orchids having fleshy tubers and flowers in erect terminal racemes | - |
| orchitis | (noun) inflammation of one or both testes; characterized by pain and swelling | - |
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| orchotomy | (noun) surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count) | - |
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| ordainer | (noun) a cleric who ordains; a cleric who admits someone to holy orders | - |
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| ordeal | (noun) a primitive method of determining a person's guilt or innocence by subjecting the accused person to dangerous or painful tests believed to be under divine control; escape was usually taken as a sign of innocence | Synonyms: trial by ordeal |
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| (noun) a severe or trying experience | - |
| order | (noun) the act of putting things in a sequential arrangement | Synonyms: ordering |
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| (noun) (architecture) one of original three styles of Greek architecture distinguished by the type of column and entablature used or a style developed from the original three by the Romans | - |
| (noun) a degree in a continuum of size or quantity | Synonyms: order of magnitude |
| (noun) a legally binding command or decision entered on the court record (as if issued by a court or judge) | Synonyms: decree, edict, fiat, rescript |
| (noun) a commercial document used to request someone to supply something in return for payment and providing specifications and quantities | Synonyms: purchase order |
| (noun) a body of rules followed by an assembly | Synonyms: parliamentary law, parliamentary procedure, rules of order |
| (noun) (often plural) a command given by a superior (e.g., a military or law enforcement officer) that must be obeyed | - |
| (noun) a request for something to be made, supplied, or served | - |
| (noun) logical or comprehensible arrangement of separate elements | Synonyms: ordering, ordination |
| (noun) (biology) taxonomic group containing one or more families | - |
| (noun) a formal association of people with similar interests | Synonyms: club, gild, guild, lodge, social club, society |
| (noun) a group of person living under a religious rule | Synonyms: monastic order |
| (noun) established customary state (especially of society) | - |
| (noun) a condition of regular or proper arrangement | Synonyms: orderliness |
| orderer | (noun) an organizer who puts things in order | Synonyms: systematiser, systematist, systematizer, systemiser, systemizer |
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| (noun) someone who places an order to buy | - |
| ordering | (noun) the act of putting things in a sequential arrangement | Synonyms: order |
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| (noun) logical or comprehensible arrangement of separate elements | Synonyms: order, ordination |
| orderliness | (noun) the quality of appreciating method and system | Synonyms: methodicalness |
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| (noun) a condition of regular or proper arrangement | Synonyms: order |
| orderly | (noun) a male hospital attendant who has general duties that do not involve the medical treatment of patients | Synonyms: hospital attendant |
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| (noun) a soldier who serves as an attendant to a superior officer | - |
| ordinal | (noun) the number designating place in an ordered sequence | Synonyms: no., ordinal number |
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| ordinance | (noun) the act of ordaining; the act of conferring (or receiving) holy orders | Synonyms: ordination |
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| (noun) an authoritative command | Synonyms: regulation |
| (noun) a statute enacted by a city government | - |
| ordinand | (noun) a person being ordained | - |
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| ordinariness | (noun) the quality of being commonplace and ordinary | Synonyms: mundaneness, mundanity |
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| ordinary | (noun) (heraldry) any of several conventional figures used on shields | - |
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| (noun) an early bicycle with a very large front wheel and small back wheel | Synonyms: ordinary bicycle |
| (noun) a clergyman appointed to prepare condemned prisoners for death | - |
| (noun) a judge of a probate court | - |
| (noun) the expected or commonplace condition or situation | - |
| ordinate | (noun) the value of a coordinate on the vertical axis | - |
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| ordination | (noun) the act of ordaining; the act of conferring (or receiving) holy orders | Synonyms: ordinance |
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| (noun) logical or comprehensible arrangement of separate elements | Synonyms: order, ordering |
| (noun) the status of being ordained to a sacred office | - |
| ordnance | (noun) military supplies | Synonyms: munition, ordnance store |
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| (noun) large but transportable armament | Synonyms: artillery, gun, heavy weapon |
| ordure | (noun) solid excretory product evacuated from the bowels | Synonyms: BM, dejection, faecal matter, faeces, fecal matter, feces, stool |
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| ore | (noun) a monetary subunit in Denmark and Norway and Sweden; 100 ore equal 1 krona | - |
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| (noun) a mineral that contains metal that is valuable enough to be mined | - |
| oregano | (noun) pungent leaves used as seasoning with meats and fowl and in stews and soups and omelets | Synonyms: marjoram |
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| (noun) aromatic Eurasian perennial | Synonyms: marjoram, Origanum vulgare, pot marjoram, wild marjoram, winter sweet |
| oreide | (noun) alloy of copper and tin and zinc; used in imitation gold jewelry | Synonyms: oroide |
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| oreo | (noun) chocolate cookie with white cream filling | Synonyms: oreo cookie |
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| organ | (noun) wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard | Synonyms: pipe organ |
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| (noun) (music) an electronic simulation of a pipe organ | Synonyms: electric organ, electronic organ, Hammond organ |
| (noun) a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows | Synonyms: harmonium, reed organ |
| (noun) a fully differentiated structural and functional unit in an animal that is specialized for some particular function | - |
| (noun) a periodical that is published by a special interest group | - |
| (noun) a government agency or instrument devoted to the performance of some specific function | - |
| organdie | (noun) a sheer stiff muslin | Synonyms: organdy |
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| organdy | (noun) a sheer stiff muslin | Synonyms: organdie |
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| organelle | (noun) a specialized part of a cell; analogous to an organ | Synonyms: cell organ, cell organelle |
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| organic | (noun) a fertilizer that is derived from animal or vegetable matter | Synonyms: organic fertiliser, organic fertilizer |
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| organicism | (noun) theory that the total organization of an organism rather than the functioning of individual organs is the determinant of life processes | - |
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| organification | (noun) the process of organ formation | - |
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| organisation | (noun) the act of organizing a business or an activity related to a business | Synonyms: organization |
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| (noun) the activity or result of distributing or disposing persons or things properly or methodically | Synonyms: organization |
| (noun) the act of forming or establishing something | Synonyms: constitution, establishment, formation, organization |
| (noun) an ordered manner; orderliness by virtue of being methodical and well organized | Synonyms: organization, system |
| (noun) an organized structure for arranging or classifying | Synonyms: arrangement, organization, system |
| (noun) a group of people who work together | Synonyms: organization |
| (noun) the persons (or committees or departments etc.) who make up a body for the purpose of administering something | Synonyms: administration, brass, establishment, governance, governing body, organization |
| organiser | (noun) a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc. | Synonyms: organizer, PDA, personal digital assistant, personal organiser, personal organizer |
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| (noun) a person who brings order and organization to an enterprise | Synonyms: arranger, organizer |
| (noun) someone who enlists workers to join a union | Synonyms: labor organizer, organizer |
| organism | (noun) a living thing that has (or can develop) the ability to act or function independently | Synonyms: being |
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| (noun) a system considered analogous in structure or function to a living body | - |
| organist | (noun) a person who plays an organ | - |
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| organization | (noun) the act of organizing a business or an activity related to a business | Synonyms: organisation |
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| (noun) the activity or result of distributing or disposing persons or things properly or methodically | Synonyms: organisation |
| (noun) the act of forming or establishing something | Synonyms: constitution, establishment, formation, organisation |
| (noun) an ordered manner; orderliness by virtue of being methodical and well organized | Synonyms: organisation, system |
| (noun) an organized structure for arranging or classifying | Synonyms: arrangement, organisation, system |
| (noun) a group of people who work together | Synonyms: organisation |
| (noun) the persons (or committees or departments etc.) who make up a body for the purpose of administering something | Synonyms: administration, brass, establishment, governance, governing body, organisation |
| organizer | (noun) a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc. | Synonyms: organiser, PDA, personal digital assistant, personal organiser, personal organizer |
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| (noun) a person who brings order and organization to an enterprise | Synonyms: arranger, organiser |
| (noun) someone who enlists workers to join a union | Synonyms: labor organizer, organiser |
| organon | (noun) a system of principles for philosophic or scientific investigations; an instrument for acquiring knowledge | - |
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| organophosphate | (noun) an insecticide that interferes with an insect's nervous system | - |
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| organs | (noun) edible viscera of a butchered animal | Synonyms: variety meat |
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| organza | (noun) a fabric made of silk or a silklike fabric that resembles organdy | - |
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| orgasm | (noun) the moment of most intense pleasure in sexual intercourse | Synonyms: climax, coming, sexual climax |
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| orgy | (noun) secret rite in the cults of ancient Greek or Roman deities involving singing and dancing and drinking and sexual activity | - |
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| (noun) any act of immoderate indulgence | Synonyms: binge, splurge |
| (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, bacchanalia, debauch, debauchery, drunken revelry, riot, saturnalia |
| oriel | (noun) a projecting bay window corbeled or cantilevered out from a wall | Synonyms: oriel window |
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| orient | (noun) the hemisphere that includes Eurasia and Africa and Australia | Synonyms: eastern hemisphere |
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| orientalism | (noun) the quality or customs or mannerisms characteristic of Asian civilizations | - |
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| orientalist | (noun) a specialist in oriental subjects | - |
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| orientation | (noun) the act of orienting | - |
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| (noun) a course introducing a new situation or environment | Synonyms: orientation course |
| (noun) an integrated set of attitudes and beliefs | - |
| (noun) a person's awareness of self with regard to position and time and place and personal relationships | - |
| (noun) a predisposition in favor of something | Synonyms: predilection, preference |
| (noun) position or alignment relative to points of the compass or other specific directions | - |
| orifice | (noun) an aperture or hole that opens into a bodily cavity | Synonyms: opening, porta |
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| oriflamme | (noun) a red or orange-red flag used as a standard by early French kings | - |
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| (noun) an inspiring symbol or ideal that serves as a rallying point in a struggle | - |
| origami | (noun) the Japanese art of folding paper into shapes representing objects (e.g., flowers or birds) | - |
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| origanum | (noun) any of various fragrant aromatic herbs of the genus Origanum used as seasonings | - |
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| origin | (noun) properties attributable to your ancestry | Synonyms: descent, extraction |
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| (noun) the point of intersection of coordinate axes; where the values of the coordinates are all zero | - |
| (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: inception, origination |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, bloodline, descent, line, line of descent, lineage, parentage, pedigree, stemma, stock |
| (noun) the place where something begins, where it springs into being | Synonyms: beginning, root, rootage, source |
| (noun) the source of something's existence or from which it derives or is derived | - |
| original | (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master, master copy |
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| (noun) something that serves as a model or a basis for making copies | Synonyms: archetype, pilot |
| originalism | (noun) the belief that the United States Constitution should be interpreted in the way the authors originally intended it | - |
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| originality | (noun) the quality of being new and original (not derived from something else) | - |
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| (noun) the ability to think and act independently | - |
| origination | (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, instauration, institution, introduction |
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| (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: inception, origin |
| originator | (noun) someone who creates new things | Synonyms: conceiver, mastermind |
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| orinasal | (noun) a speech sound produced with both the oral and nasal passages open (as French nasal vowels) | Synonyms: orinasal phone |
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| oriole | (noun) American songbird; male is black and orange or yellow | Synonyms: American oriole, New World oriole |
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| (noun) mostly tropical songbird; the male is usually bright orange and black | Synonyms: Old World oriole |
| orison | (noun) reverent petition to a deity | Synonyms: petition, prayer |
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| orlop | (noun) the fourth or lowest deck | Synonyms: fourth deck, orlop deck |
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| ormer | (noun) an abalone found near the Channel Islands | Synonyms: Haliotis tuberculata, sea-ear |
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| ormolu | (noun) brass that looks like gold; used to decorate furniture | - |
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| ornament | (noun) something used to beautify | Synonyms: decoration, ornamentation |
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| ornamental | (noun) any plant grown for its beauty or ornamental value | - |
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| ornamentalism | (noun) the practice of ornamental display | - |
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| ornamentalist | (noun) someone who decorates | Synonyms: decorator |
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| ornamentation | (noun) the act of adding extraneous decorations to something | Synonyms: embellishment |
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| (noun) something used to beautify | Synonyms: decoration, ornament |
| (noun) the state of being ornamented | - |
| ornateness | (noun) an ornate appearance; being elaborately (even excessively) decorated | Synonyms: elaborateness |
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| (noun) high-flown style; excessive use of verbal ornamentation | Synonyms: grandiloquence, grandiosity, magniloquence, rhetoric |