名詞 ear canal:

1. either of the passages in the outer ear from the auricle to the tympanic membrane
   同義詞：auditory meatus, acoustic meatus, auditory canal, external auditory canal

1. The absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
   (先天性)閉鎖，無孔正常的身體孔或管道，如肛門、腸或外耳道的缺失或閉合