| 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 |
| orneriness | (noun) meanspirited disagreeable contrariness | Synonyms: cussedness |
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| ornithine | (noun) an amino acid that does not occur in proteins but is important in the formation of urea | - |
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| ornithischian | (noun) herbivorous dinosaur with a pelvis like that of a bird | Synonyms: ornithischian dinosaur |
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| ornithologist | (noun) a zoologist who studies birds | Synonyms: bird watcher |
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| ornithology | (noun) the branch of zoology that studies birds | - |
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| ornithomimid | (noun) lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes | - |
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| ornithopod | (noun) bipedal herbivorous dinosaur | Synonyms: ornithopod dinosaur |
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| ornithopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: orthopter |
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| ornithosis | (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: parrot fever, psittacosis |
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| orogeny | (noun) the process of mountain formation (especially by the upward displacement of the earth's crust) | - |
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| orograph | (noun) A machine for use in making topographical maps. | - |
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| orography | (noun) the science of mountains | Synonyms: orology |
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| oroide | (noun) alloy of copper and tin and zinc; used in imitation gold jewelry | Synonyms: oreide |
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| orology | (noun) the science of mountains | Synonyms: orography |
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| oropharynx | (noun) cavity formed by the pharynx at the back of the mouth | - |
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| orphan | (noun) a young animal without a mother | - |
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| (noun) the first line of a paragraph that is set as the last line of a page or column | - |
| (noun) a child who has lost both parents | - |
| (noun) someone or something who lacks support or care or supervision | - |
| orphanage | (noun) a public institution for the care of orphans | Synonyms: orphans' asylum |
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| (noun) the condition of being a child without living parents | Synonyms: orphanhood |
| orphanhood | (noun) the condition of being a child without living parents | Synonyms: orphanage |
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| orphenadrine | (noun) a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism | Synonyms: Norflex |
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| orphrey | (noun) a richly embroidered edging on an ecclesiastical vestment | - |
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| orpiment | (noun) a yellow mineral occurring in conjunction with realgar; an ore of arsenic | - |
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| orpin | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpine, Sedum telephium |
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| orpine | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpin, Sedum telephium |
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| orrery | (noun) planetarium consisting of an apparatus that illustrates the relative positions and motions of bodies in the solar system by rotation and revolution of balls moved by wheelwork; sometimes incorporated in a clock | - |
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| orris | (noun) German iris having large white flowers with lavender-tinged falls and a fragrant rhizome | Synonyms: Florentine iris, Iris florentina, Iris germanica florentina |
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| (noun) fragrant rootstock of various irises especially Florentine iris; used in perfumes and medicines | Synonyms: orrisroot |
| orrisroot | (noun) fragrant rootstock of various irises especially Florentine iris; used in perfumes and medicines | Synonyms: orris |
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| orthicon | (noun) a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons | Synonyms: image orthicon |
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| orthochorea | (noun) a form of chorea in which spasms occur mainly when the patient is erect | - |
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| orthoclase | (noun) a white or colored monoclinic feldspar | - |
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| orthodontia | (noun) the branch of dentistry dealing with the prevention or correction of irregularities of the teeth | Synonyms: dental orthopaedics, dental orthopedics, orthodontics, orthodonture |
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| orthodontics | (noun) the branch of dentistry dealing with the prevention or correction of irregularities of the teeth | Synonyms: dental orthopaedics, dental orthopedics, orthodontia, orthodonture |
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| orthodontist | (noun) a dentist specializing in the prevention or correction of irregularities of the teeth | - |
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| orthodonture | (noun) the branch of dentistry dealing with the prevention or correction of irregularities of the teeth | Synonyms: dental orthopaedics, dental orthopedics, orthodontia, orthodontics |
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| orthodoxy | (noun) the quality of being orthodox (especially in religion) | - |
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| (noun) a belief or orientation agreeing with conventional standards | - |
| orthoepist | (noun) a practitioner of orthoepy (especially one of the 17th or 18th century scholars who proposed to reform English spelling so it would reflect pronunciation more closely) | - |
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| orthoepy | (noun) a term formerly used for the part of phonology that dealt with the `correct' pronunciation of words and its relation to `correct' orthography | - |
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| (noun) the way a word or a language is customarily spoken | Synonyms: pronunciation |
| orthogonality | (noun) the quality of lying or intersecting at right angles | - |
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| (noun) the relation of opposition between things at right angles | Synonyms: orthogonal opposition, perpendicularity |
| orthography | (noun) a method of representing the sounds of a language by written or printed symbols | Synonyms: writing system |
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| orthomyxovirus | (noun) a group of viruses including those causing influenza | - |
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| orthopaedics | (noun) the branch of medical science concerned with disorders or deformities of the spine and joints | Synonyms: orthopedics |
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| orthopaedist | (noun) a specialist in correcting deformities of the skeletal system (especially in children) | Synonyms: orthopedist |
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| orthopedics | (noun) the branch of medical science concerned with disorders or deformities of the spine and joints | Synonyms: orthopaedics |
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| orthopedist | (noun) a specialist in correcting deformities of the skeletal system (especially in children) | Synonyms: orthopaedist |
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