external ear

名词 external ear:

1. the part of the ear visible externally
   同义词：outer ear

1. Any of various structures, such as the external ear, that resemble a shell in shape.
   贝壳状结构任一种类似于贝壳的形状结构，例如人的外耳
2. The absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
   (先天性)闭锁，无孔正常的身体孔或管道，如肛门、肠或外耳道的缺失或闭合