| 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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| 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) |