nomen dubium

noun

no·​men du·​bi·​um ˈnō-mən-ˈdü-bē-əm 

-ˈdyü-

plural nomina dubia ˈnä-mə-nə-ˈdü-bē-ə 

-ˈdyü-,

ˈnō-

: a taxonomic name that cannot be assigned with certainty to any taxonomic group because the description is insufficient for identification and the original specimens no longer exist

Word History

Etymology

New Latin, doubtful name

First Known Use

1915, in the meaning defined above