(1):

(n.) The external ear, or that part of the ear which is prominent from the head.

(2):

(n.) The chamber, or one of the two chambers, of the heart, by which the blood is received and transmitted to the ventricle or ventricles; - so called from its resemblance to the auricle or external ear of some quadrupeds. See Heart.

(3):

(n.) An angular or ear-shaped lobe.

(4):

(n.) An instrument applied to the ears to give aid in hearing; a kind of ear trumpet.