auricle (n.)youdaoicibaDictYouDict[auricle 词源字典]
part of the ear, 1650s, from Latin auricula "ear," diminutive of auris (see ear (n.1)). As a chamber of the heart, early 15c., from Latin, so called from a perceived similarity in shape to an animal's ear.[auricle etymology, auricle origin, 英语词源]