| 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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| orthophosphate | (noun) a salt of phosphoric acid | Synonyms: inorganic phosphate, phosphate |
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| orthopnea | (noun) form of dyspnea in which the person can breathe comfortably only when standing or sitting erect; associated with asthma and emphysema and angina pectoris | - |
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| orthopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: ornithopter |
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| orthopteran | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteron, orthopterous insect |
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| orthopteron | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteran, orthopterous insect |
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| orthoptics | (noun) treatment of defects of binocular vision (such as strabismus and amblyopia) by nonsurgical measures (especially by exercises to strengthen the eye muscles) | - |
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| orthoptist | (noun) a specialist in orthoptics | - |
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| orthoscope | (noun) an ophthalmoscope with a layer of water to neutralize the refraction of the cornea | - |
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| ortolan | (noun) brownish Old World bunting often eaten as a delicacy | Synonyms: Emberiza hortulana, ortolan bunting |
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| ortygan | (noun) any of several East Indian birds | - |
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| oryx | (noun) large African antelope with long straight nearly upright horns | Synonyms: pasang |
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| orzo | (noun) pasta shaped like pearls of barley; frequently prepared with lamb in Greek cuisine | - |
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