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Definition the lower jaw in vertebrates

or (more rarely):

in arthropods such as insects and arachnids:  either of two jaws
  • Neanderthals had prominent brows and thick mandibles.
  • Is it the strange gnashing sound of insects with their mandibles moving through the bone marrow?
    Joy Kogawa  --  Obasan
  • I think the horn–covered mandibles of one of these squid are entangled in the blades.
    Jules Verne  --  Twenty Thousand Leagues Under the Sea
  • Now black mandibles protruded from her mouth like tusks.
    Rick Riordan  --  The Mark of Athena
  • The maxilla, the mandible to form a jaw.
    Ted Dekker  --  BoneMan's Daughters
  • The tank bugs clacked their mandibles and edged closer.
    Rick Riordan  --  The Hidden Oracle
  • Its tiny mouth opened, and she saw that it had sharp cutting mandibles behind its upper and lower lips.
    Christopher Paolini  --  Inheritance
  • There were orange traffic cones and beautiful lapis lazuli insects with mandibles of gold.
    Alice Sebold  --  The Lovely Bones
  • In the upper and lower mandibles.
    Robert Ludlum  --  The Bourne Ultimatum
  • Elbowed antennae trembled, mandibles clicked, and they began marching along the edge in an orderly clockwise procession.
    Henry H. Neff  --  The Second Siege
  • Clinging to his chest, it spread its mandibles wide so that their razor tips were poised on either side of his throat.
    Henry H. Neff  --  The Maelstrom
  • Except scarab beetles didn't have the big cutting mandibles.
    John Ringo  --  Live Free or Die
  • And when she opened her mouth, sideways mandibles snapped and retracted outside her regular human teeth.
    Rick Riordan  --  The Red Pyramid
  • To sum up, then: in the Right Whale's there is no great well of sperm; no ivory teeth at all; no long, slender mandible of a lower jaw, like the Sperm Whale's.
    Herman Melville  --  Moby Dick
  • The ants were still there; their wispy antennae weaving from side to side like the arms of so many punch-drunk boxers; their mandibles were open wide, eager to bite again.
    James Vance Marshall  --  Walkabout
  • There are grasshoppers, spruce budworms, forest tent caterpillars, wood-boring beetles, each one the size of a page, their parts neatly labeled: mandibles, palps, antennae, thorax, abdomen.
    Margaret Atwood  --  Cat's Eye
  • ...whom it set dreaming of artificial charms and a refinement of sensual bliss; and then, behind him, M. de Palancy, who with his huge carp's head and goggling eyes moved slowly up and down the stream of festive gatherings, unlocking his great mandibles at every moment as though in search of his orientation, had the air of carrying about upon his person only an accidental and perhaps purely symbolical fragment of the glass wall of his aquarium, a part intended to suggest the whole which...
    Marcel Proust  --  Swann's Way
  • Arachne snapped her mandibles.
    Rick Riordan  --  The Mark of Athena
  • Arachne's lips curled over her mandibles.
    Rick Riordan  --  The Mark of Athena
  • She clicked her mandibles doubtfully.
    Rick Riordan  --  The Hidden Oracle

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