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mentum 頦; 下顎 頦; 下顎 mentum n 1: a projection like a chin formed by the sepals and base of the column in some orchids 2: the protruding part of the lower jaw [synonym: {chin}, {mentum}] 3: a projection below the mouth of certain mollusks that resembles a chin mentum \men"tum\, n. [L., chin.] (Zool.)
The front median plate of the labium in insects. See {Labium}. [1913 Webster]
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