(Anatomy & Zoology)a part resembling a spiral shell, in particular (剖,动)蛤壳,螺壳状部分,尤指 ■the depression in the external ear leading to its central opening 耳廓,耳甲 ■(亦作 nasal concha)any of several thin, scroll-like (turbinate) bones in the sides of the nasal cavity 鼻甲