|1.||a. the upper chamber of the heart; atrium|
|b. a small sac in the atrium of the heart|
|2.||anatomy Also called: pinna the external part of the ear|
|3.||biology Also called: auricula an ear-shaped part or appendage, such as that occurring at the join of the leaf blade and the leaf sheath in some grasses|
|[C17: from Latin auricula the external ear, from auris 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.
|auricle (ôr'ĭ-kəl) Pronunciation Key