/ˈkwɒdrət/
1
- （亦作quadrate bone）Zoology (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【生】（鸟或爬行动物的头骨内的）方骨。
词源
late Middle English (as an adjective)： from Latin quadrat-'made square'， from the verb quadrare, from quattuor 'four'.