Quadrate

[Sarah]

A plane surface with four equal sides and four right angles; asquare; hence, figuratively, anything having the outline of a square.At which command, the powers militant That stood for heaven, inmighty quadrate joined. Milton.

[Magaret]

(in the skull of a bird or reptile) a squarish bone with which the jaw articulates, thought to be homologous with the incus of the middle ear in mammals.

[Tracie Lynn]

a square or cube-shaped part of the body: