quadrate bone

/K W AA0 D R EY0 T B OW0 N/
noun
  1. 1

    A bone between the base of the lower jaw and the skull in most vertebrates other than mammals. In reptiles and birds it articulates the lower jaw with the skull; in mammals it is represented by the incus.

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Source: https://en.wiktionary.org/wiki/quadrate%20bone