单词	pinna
释义	pinna noun pin·​na ˈpi-nə  plural pinnae ˈpi-ˌnē  -ˌnī or pinnas 1 a : a projecting body part (such as a feather, wing, or fin) b : the largely cartilaginous projecting portion of the external ear see ear illustration 2 : a leaflet or primary division of a pinnate leaf or frond Example Sentences Recent Examples on the Web Humans do have weak vestigial muscles attached to the shell of the ear, called the auricle or pinna, as well as evidence of a vestigial nervous system, which could have functioned to orient the ears. C. Claiborne Ray, New York Times, 16 Jan. 2017 Word History Etymology New Latin, from Latin, feather, wing — more at pen First Known Use 1682, in the meaning defined at sense 2 Medical Definition pinna noun pin·​na ˈpin-ə  plural pinnae ˈpin-ˌē  -ˌī  or pinnas : the largely cartilaginous projecting portion of the external ear
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