- Anatomy.
- the projecting outer portion of the ear; pinna.
- an ear-shaped appendage projecting from each atrium of the heart.
- (loosely) the atrium.
- a part like or likened to an ear.
- the upper chamber of the heart; atrium
- a small sac in the atrium of the heart
- the external part of the ear
- an ear-shaped part or appendage, such as that occurring at the join of the leaf blade and the leaf sheath in some grasses
