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. Syn: auricula atrialis [NA], atrial auricle, atrial auricula, auricle(2), auricula(2), auricular appendage(1), auricular appendix, skin tag.