quadrate
▸ noun /ˈkwɒdrət
/
1 Zoology (also quadrate bone) (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.
– ORIGIN late Middle English (as an adjective): from Latin quadrat- ‘made square’, from the verb quadrare, from quattuor ‘four’.