| NMA | National Malaria Association; National Medical Association; neurogenic muscular atrophy; N-nitroso-N... |
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| OA | obstructive apnea; occipital artery; occipito-anterior; occiput anterior; octanoic acid; ocular albi... |
| OAK | Kjer optic atrophy |
| OCA | oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent |
| OPCA | olivopontocerebellar atrophy |
| catheterization, central venous | Placement of an intravenous catheter in the subclavian, jugular, or other central vein for central venous pressure determination, chemotherapy, haemodialysis, or hyperalimentation. (12 Dec 1998) |
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| measures of central tendency | General term for several characteristics of the distribution of a set of measurements or values around a value or values at or near the middle of the set; the principal measures of central tendency are mean, median, and mode. (05 Mar 2000) |
| medial central nucleus of thalamus | A small cell group in the interthalamic adhesion of the thalamus, occupying the midline region of the internal medullary lamina, between the left and the right paracentral nucleus. Synonym: nucleus medialis centralis thalami. (05 Mar 2000) |
| central africa | <geography> The geographical area of africa comprising cameroon, central african republic, chad, congo, equatorial guinea, gabon, and democratic republic of the congo. (12 Dec 1998) |
| central amputation | Amputation in which the flaps are so united that the cicatrix runs across the end of the stump. (05 Mar 2000) |
| central and lateral intermediate substance | The central gray matter of the spinal cord surrounding the central canal. Synonym: substantia intermedia centralis et lateralis, anterior gray column, Stilling's gelatinous substance, substantia gelatinosa centralis. (05 Mar 2000) |
| central angiospastic retinitis | An obsolete term for central serous choroidopathy. (05 Mar 2000) |
| central angiospastic retinopathy | Detachment of the sensory retina induced by decreased adhesion between cells of the retinal pigment epithelium which permits plasma from the choriocapillaris to enter subretinal space. Synonym: central angiospastic retinopathy, central serous retinopathy. (05 Mar 2000) |
| central apnea | Apnea as the result of medullary depression which inhibits respiratory movement. (05 Mar 2000) |
| central apparatus | The centrosome and centrosphere. (05 Mar 2000) |
| central areolar choroidal sclerosis | A slowly progressive pigmentary degeneration in young persons; characterised by black foci closely set together and coalescent at the posterior pole and macular region. Synonym: central areolar choroidal atrophy, central areolar choroidal sclerosis. (05 Mar 2000) |
| central artery | <anatomy, artery> A branch of the terminal part of the middle cerebral artery distributed to the cortex on either side of the central sulcus. Synonym: arteria sulci centralis, artery of central sulcus, central artery, Rolandic artery. (05 Mar 2000) |
| central artery of retina | A branch of the ophthalmic artery which penetrates the optic nerve 1 cm behind the eye to enter the eye at the optic papilla in the retina; it divides into superior and inferior temporal and nasal branches. Synonym: arteria centralis retinae, arteria retinae centralis, Zinn's artery. (05 Mar 2000) |
| central atom | <physics> The atom to which the other atoms are bonded in a small molecule. (09 Oct 1997) |
| central bearing | In dentistry, application of forces between the maxillae and mandible at a single point located as near as possible to the centre of the supporting areas of the upper and lower jaws; used for the purpose of distributing closing forces evenly throughout the areas of the supporting structures during the recording of maxillomandibular (jaw) relations and during the correction of occlusal errors. (05 Mar 2000) |