| taxonomy | <zoology> The theories and techniques of naming, describing, and classifying organisms, the study of the relationships of taxa,including positional changes which do not involve changes in the names of taxa. The taxonomic hierarchy is, from top to bottom: kingdom, phylum (for animals) or division (for plants and fungi), class, order, family, genus, species. (09 Jan 1998) |
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| chemical taxonomy | An approach to the classification of organisms based on the distribution of natural products. (05 Mar 2000) |
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| numerical taxonomy | <zoology> Study of the relationships of taxa by the application of numerical similarity values to characters so as to rank into categories based on degree of overall similarity. (09 Jan 1998) |