1. A taxonomic designation in which the genus and species names are the same; for example, Gorilla gorilla (the gorilla), Mephitis mephitis (striped skunk), and Chloris chloris (the greenfinch). This is okay in zoology, but is no longer considered acceptable in botany.

2. A word composed of two identical parts, for example tomtom, tutu, or goody-goody.

Etymology: From the Greek roots tauto-, meaning identical, and -nym, meaning name.

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