| 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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| orthodontic | (adjective) of or relating to or involving or practicing orthodontics | - |
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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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| orthodox | (adjective) adhering to what is commonly accepted | - |
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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 |
| orthogonal | (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, impertinent |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: rectangular |
| (adjective) statistically unrelated | - |
| 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 |
| orthographic | (adjective) of or relating to or expressed in orthography | - |
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| orthography | (noun) a method of representing the sounds of a language by written or printed symbols | Synonyms: writing system |
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| orthomolecular | (adjective) designating or relating to a form of treatment of mental disorders that seeks to restore biochemical balance in the body with large doses of vitamins and minerals | - |
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| orthomyxovirus | (noun) a group of viruses including those causing influenza | - |
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| orthopaedic | (adjective) of or relating to orthopedics | Synonyms: orthopedic, orthopedical |
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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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| orthopedic | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedical |
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| orthopedical | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedic |
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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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| orthoptic | (adjective) of or relating to normal binocular vision | - |
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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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| orthostatic | (adjective) pertaining to an upright standing posture | - |
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| orthotropous | (adjective) (of a plant ovule) completely straight with the micropyle at the apex | - |
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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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