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nomen nu·dum | \ -ˈnü-dəm 
, -ˈnyü-\
, -ˈnyü-\ plural nomina nuda\ -ˈnü-də , -ˈnyü- \
, -ˈnyü- \Definition of nomen nudum
: a proposed taxonomic name that is invalid because the group designated is not described or illustrated sufficiently for recognition, that has no nomenclatural status, and that consequently can be used as though never previously proposed
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