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Trinomial nomenclature

names for taxa below the rank of species; these names have three parts; the usage is different in zoology and botany

In biology, trinomial nomenclature is used to name living things at a rank lower than species. The term trinomial nomenclature means "three-part name" or "system of three-part names".

If living things at a rank lower than species get a scientific name, each name has three parts. The first part indicates the genus, the second part indicates the species, and the third part is particular to the living thing (at whatever rank it has been assigned).

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