| oneirophrenia | A state in which hallucinations occur, caused by such conditions as prolonged deprivation of sleep, sensory isolation, and a variety of drugs. Origin: G. Oneiros, dream, + phren, mind (05 Mar 2000) |
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| oneiroscopy | Rarely used term for the diagnosis of a person's mental state by an analysis of his dreams. Origin: G. Oneiros, dream, + skopeo, to examine (05 Mar 2000) |
| oniomania | <psychiatry> Rarely used term for the morbidly exaggerated need or urge to buy beyond the realistic needs of the individual. Origin: G. Onios, for sale, + mania, insanity (05 Mar 2000) |
| onion | <botany> A liliaceous plant of the genus Allium (A.cepa), having a strong-flavored bulb and long hollow leaves; also, its bulbous root, much used as an article of food. The name is often extended to other species of the genus. <zoology> Onion fish, a dipterous insect whose larva feeds upon the onion; especially, Anthomyia ceparum and Ortalis flexa. Welsh onion. Origin: F. Ognon, fr. L. Unio oneness, unity, a single large pearl, an onion. See One, Union. Source: Websters Dictionary (01 Mar 1998) |
| onion bodies | An obsolete term for epithelial nest. (05 Mar 2000) |
| onion bulb neuropathy | Designation for any of several demyelinating polyneuropathies in which the nerves are enlarged, due to onion bulb formation-whorls of overlapping Schwann cell processes encircling bare medullated axons, e.g., progressive hypertrophic polyneuropathy. See: hypertrophic interstitial neuropathy. (05 Mar 2000) |
| onions | Herbaceous biennial plants and their edible bulbs, belonging to the liliaceae. (12 Dec 1998) |
| oniric | 1. Pertaining to dreams. 2. Pertaining to the clinical state of oneirophrenia. Synonym: oniric. Origin: G. Oneiros, dream (05 Mar 2000) |
| onko- | See: onco-. (05 Mar 2000) |
| onlay | 1. A metal (usually gold) cast restoration of the occlusal surface of a posterior tooth or the lingual surface of an anterior tooth, the entire surface of which is in dentin without side walls; retention in the anterior tooth is by pins and in the posterior by pins and/or boxes in retentive grooves in the buccal and lingual walls. 2. A graft applied on the exterior of a bone. (05 Mar 2000) |
| onlay graft | A bone graft applied on the outside of the recipient bone(s). (05 Mar 2000) |
| online systems | Systems where the input data enter the computer directly from the point of origin (usually a terminal or workstation) and/or in which output data are transmitted directly to that terminal point of origin. (12 Dec 1998) |
| only child | Child who has no siblings. (12 Dec 1998) |
| onocerin | <chemistry> A white crystalline waxy substance extracted from the root of the leguminous plant Ononis spinosa. Origin: NL. Ononis, the generic name of the plant + L. Cera wax. Source: Websters Dictionary (01 Mar 1998) |
| Onodi | A., 20th century Hungarian laryngologist. See: Onodi cell. (05 Mar 2000) |