Dictionary

nomen dubium

noun nomen du·bi·um \-ˈdü-bē-əm, -ˈdyü-\
plural nomina du·bia \-bē-ə\

Definition of NOMEN DUBIUM

:  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

Origin of NOMEN DUBIUM

New Latin, doubtful name
First Known Use: 1937

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