Tautonym definitions

tô'tə-nĭm'
A taxonomic designation, such as Gorilla gorilla, in which the genus and species names are the same, commonly used in zoology but no longer in botany.
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A scientific name consisting of two terms, in which the generic name and specific name are the same (Ex.: Vulpes vulpes, the red fox): this kind of name is no longer used in botany, but is common in zoology.
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A scientific name consisting of three terms, in which the name of the typical subdivision of the species repeats the specific name (Ex.: Lama glama glama, a domesticated llama)
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A taxonomic designation, such as Gorilla gorilla, in which the genus and species names are the same, commonly used in zoology but no longer in botany.
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(biology, informal) A binomial name consisting of the same word twice, such as Bison bison.
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Origin of tautonym

taut- +"Ž -onym