part of the ear, 1650s, from Latin auricula "ear," diminutive of auris (see ear (n.1)). As a chamber of the heart, early 15c., from Latin, so called from a perceived similarity in shape to an animal's ear.
auricle au·ri·cle (ôr'ĭ-kəl)
The projecting shell-like structure on the side of the head constituting, with the external acoustic meatus, the external ear. Also called pinna.