mandible - definition and synonyms

noun [countable] medical 

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/ˈmændɪb(ə)l/
singularmandible
pluralmandibles
  1. the lower jaw of a person, animal, or fish
     Synonyms and related words
     Synonyms and related words
    1. a.
      the top or bottom part of a bird’s beak
       Synonyms and related words
    2. b.
      either of the two parts of an insect’s mouth that it uses for biting