Scientific name involving a repeated word

• Taxonomic designation like Rattus rattus
• Pulled — hard — leg of the setter about taxonomic term

Wiktionary Word definitions in Wiktionary
n. (context biology informal English) A binomial name consisting of the same word twice, such as ''Bison bison''.

Wikipedia Word definitions in Wikipedia
A tautonym is a scientific name of a species in which both parts of the name have the same spelling, for example Bison bison . The first part of the name is the name of the genus and the second part is referred to as the specific epithet in the International ...