(of atria) Type: Term Definitions: 1. a small conic ('ear-shaped') pouch projecting from the upper anterior portion of each atrium of the heart, slightly increasing the atrial volume. Synonyms: auricula2, auriculae atrii, atrial appendage, atrial auricle, atrial auricula, auricular appendix See: left auricle, right auricle &nbs... Found on http://www.medilexicon.com/medicaldictionary.php?t=8633