| OND | Ophthalmic Nursing Diploma; orbitonasal dislocation; other neurological disorders |
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| OPL | other party liability; outer plexiform layer; ovine placental lactogen |
| ORM | orosomucoid; other regulated material; oxygen ratio monitor |
| OTPS | other than personal services |
| qod | every other day [Lat. quaque altera die] |
| Central European tick-borne fever | 1. (Central European subtype) tick-borne meningoencephalitis caused by a flavivirus closely related to the virus causing the Far Eastern type; it is transmitted by Ixodes ricinus, also by infected raw milk, especially that of goats. Synonym: biundulant meningoencephalitis, Central European tick-borne fever, diphasic milk fever, Russian spring-summer encephalitis (Western subtype). 2. (Eastern subtype) tick-borne encephalitis, a severe form of encephalitis caused by a flavivirus, a virus belonging to the Flaviviridae family, and transmitted by ticks (Ixodes pertulcatus and I. Ricinus). Synonym: Russian tick-borne encephalitis. (05 Mar 2000) |
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| central excitatory state | The building up of excitatory influences produced by individual impulses finally causes firing of the next neuron. (05 Mar 2000) |
| central fibrous body | <anatomy, cardiology> The fibrous area where the leaflets of the aortic, mitral, and tricuspid valves meet in the heart. (05 Mar 2000) |
| central ganglioneuroma | <tumour> A rare lesion that contains neuronal (ganglion) cells in a sparse glial stoma. Synonym: central ganglioneuroma. Origin: Ganglion + G. Kytos, cell, + -oma, tumour (05 Mar 2000) |
| central gray substance | In general: the predominantly small-celled gray matter adjoining or surrounding the central canal of the spinal cord and the third and fourth ventricles of the brainstem, in particular: the thick sleeve of gray matter surrounding the cerebral sylvian aqueduct in the midbrain, rostrally continuous with the posterior nucleus of the hypothalamus; in sections stained for myelin it stands out from the adjoining tectum and tegmentum by the poverty of its myelinated fibres. Synonym: substantia grisea centralis. (05 Mar 2000) |
| central group of axillary lymph nodes | Nodes located around the midportion of the axillary vein; they receive afferent vessels from the lateral (brachial), pectoral, and subscapular groups of axillary nodes and send efferent vessels to the apical group of axillary node's. (05 Mar 2000) |
| central gyri | The precentral and postcentral gyri. Gyri cerebri Gyri of cerebrum, the gyri or convolutions of the cerebral cortex. Cingulate gyrus, a long, curved convolution of the medial surface of the cortical hemisphere, arched over the corpus callosum from which it is separated by the deep sulcus of corpus callosum; together with the parahippocampal gyrus, with which it is continuous behind the corpus callosum, it forms the fornicate gyrus. Synonym: gyrus cinguli, callosal convolution, callosal gyrus, cingulate convolution, falciform lobe, lobus falciformis. (05 Mar 2000) |
| central illumination | axial illumination |
| central implantation | <obstetrics> Implantation in which the blastocyst remains in the uterine cavity, as in carnivores, rhesus monkeys, and rabbits. Synonym: circumferential implantation, superficial implantation. (05 Mar 2000) |
| central incisor | <dentistry> The first tooth in the maxilla and mandible on either side of the midsagittal plane of the head. (05 Mar 2000) |
| central inhibition | <physiology> Suppression or diminution of outgoing impulses from a reflex centre. (05 Mar 2000) |
| central lacteal | The blindly ending lymphatic capillary in the centre of an intestinal villus. (05 Mar 2000) |
| central lateral nucleus of thalamus | The most lateral of the intralaminar nuclei of the thalamus. Synonym: nucleus centralis lateralis thalami. (05 Mar 2000) |
| central limit theorem | The sum (or average) of n realizations of the same process, provided only that it has a finite variance, will approach the gaussian distribution as n becomes indefinitely large. This theory provides a broad warrant for the use of normal theory even for nongaussian data. In the form stated here, it constitutes the classical version; more general versions allow serious relaxation of the usual assumptions. (05 Mar 2000) |
| central line | <equipment> Small, flexible plastic tube inserted into the large vein above the heart, through which drugs and blood products can be given and blood samples withdrawn painlessly. Synonym: central line, Hickman catheter. (12 Jan 1998) |