(systematics) The designation of subspecies by a three-word name.
Trinomial nomenclature
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(trī′nō·mē·əl ′nō·mən′klā·chər)
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In biology, trinomial nomenclature refers to names for taxa below the rank of species. This is different for animals and plants:
- for animals see trinomen. There is only one rank allowed below the rank of species: subspecies.
- for plants see ternary name. There is an indeterminate number of infraspecific ranks allowed below the level of species: subspecies is the highest ranked of these.
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