A small conical ('ear-shaped') pouch projecting from the upper anterior portion of each atrium of the heart, increasing slightly the atrial volume. ... See: auricle of left atrium, auricle of right atrium. ... Synonym: auricula atrialis, atrial auricle, atrial auricula, auricle, auricula, auricular appendage, auricular appendix, skin tag. ... (05 M...