| NSD | Nairobi sheep disease; neonatal staphylococcal disease; neurosecretory dysfunction; night sleep depr... |
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| NGT | nasogastric tube; nominal group technique; normal glucose tolerance |
| NSD | Nominal Standard Dose |
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| nominal taxon | <zoology> A named taxon, objectively defined by its type taxon Thus the nominal family muscidae is always the one to which its nominal type genus, Musca, belongs. (09 Jan 1998) |
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| nominal aphasia | An aphasia in which the principal deficit is difficulty in naming persons and objects seen, heard, or felt; due to lesions in various portions of the language area. Synonym: amnestic aphasia, amnesic aphasia, anomia, anomic aphasia. (05 Mar 2000) |
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| nominate subordinate taxon | <zoology> A subordinate taxon which bears the same names as its immediate higher taxon. Thus Grus grus is the nominate species of the genus Grus. (09 Jan 1998) |
| taxon | A group or category, at any level, in a system for classifying plants or animals. (09 Oct 1997) |
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