Definition of mandible in US English:



Anatomy Zoology
  • 1The jaw or a jawbone, especially the lower jawbone in mammals and fishes.

    • ‘In the mandible, there are four incisors, two canines, four premolars, and six molars.’
    • ‘The human remains comprise one complete mandible, two fragmentary mandibles, and a cranial fragment.’
    • ‘Both wolves and spotted hyenas tend to leave the skulls and mandibles of their prey behind, but they often remove entire limbs, especially from the upper exposed side of the carcass.’
    • ‘The tongue is suspended from the inside of the mandible above the hyoid bone and has muscles with a range of different orientations.’
    • ‘Most use their maxillae and mandibles to take in food.’
    jawbone, lower jaw
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    1. 1.1 Either of the upper and lower parts of a bird's beak.
      ‘the drake is all black except for an orange mark on the upper mandible’
      • ‘The bill is a pinkish horn color and dark markings appear on the upper mandible.’
      • ‘The young birds' mandibles begin to cross about two weeks after they fledge, and they learn to extract seeds soon after that.’
      • ‘Breeding adults have a laterally flattened horn on the upper mandible.’
      • ‘The upper mandible of the bill is dark, and the legs are bright orange.’
      • ‘In addition, bill curvature was measured, taking the radius of the height of the upper mandible from the line traced from the base to the tip of the bill.’
      bill, nib
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    2. 1.2 Either half of the crushing organ in an arthropod's mouthparts.
      • ‘The trap-jaw ant fires its mandibles with such force to propel itself to the front of the pack.’
      • ‘They crush the honeybees in their mandibles one after another until the bees are all dead.’
      • ‘Centipedes were measured from the tip of the upper mandible to the posterior end of the last body segment.’


Late Middle English: from Old French, or from late Latin mandibula, from mandere ‘to chew’.