noun (n)

• a projection like a chin formed by the sepals and base of the column in some orchids(noun.plant)

  source: wordnet30
• the protruding part of the lower jaw(noun.body)

  Synonym:
  chin
  

  source: wordnet30
• a projection below the mouth of certain mollusks that resembles a chin(noun.body)

  source: wordnet30
• The front median plate of the labium in insects. See Labium.(noun)

  source: webster1913