Definition of "mentum" [‖men•tum]

• The chin. (noun)
• A chin-like projection below the mouth of certain mollusks. (noun)

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• "Mentum: a labial sclerite bearing the movable parts; attached to and sometimes fused with the sub-mentum; corresponds to the (united) stipes of maxillae: in Coleoptera, what is usually called mentum is really submentum: in Diptera, the term is applied to the posterior oral margin: in Hymenoptera, is part of "tongue," the second joint bearing the labial palpi, paraglossae and ligula."
• "A 2004 presidential bid failed to recapture the Joe-mentum'' of the earlier race, and he bowed out early."
• "As Mike Ditka might say, the Chicago bid needs more mo-mentum as the race nears the wire."