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