mentum

/M EH1 N T AH0 M/
noun
  1. 1

    The chin.

  2. 2

    A chin-like projection below the mouth of certain mollusks.

  3. 3

    The central part of the labium in insects.

  4. 4

    A projection in front of the flower in some orchids.

Source: https://en.wiktionary.org/wiki/mentum