Mentum

Chamber's Twientieth Century Dictionary · 1908 · p. 64

men′tum, n. the chin: the central part of the labium in insects: ( bot. ) a projection in front of the flower in some orchids.— n. Mentag′ra , an eruption about the chin forming a crust.— adj. Men′tal ( an at. ), pertaining to the chin. [L., the chin.]