Mentum

·noun The front median plate of the labium in insects. ·see Labium.

mentum
mentum, i, n. [root men-, min-, to project; cf.: minae, minari, etc.], the chin of persons and anima...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
mentum
mentum ī n 2 MAN-, the chin : paulo attritius: incana, beards , V., H. ...

An Elementary Latin Dictionary