Definition of: tautonymy

(tô·ton′ə·mē) noun plural ·mies Biol.
1. The possession by two or more distinct plants or animals of the same generic and specific names: prohibited by the rules of scientific nomenclature.
2. Identity of the generic, specific, and sub-specific names of a given plant or animal, as Bison bison bison: a permitted practice. [<TAUTO- + Gk. onyma name]
—tau·to·nym·ic (tô′tə·nim′ik) adjective