n.
Pronunciation: ' pi-n ə
Function: noun
Inflected Form: plural pin · nae \ ' pi- ˌ n ē , - ˌ n ī \ or pinnas
Etymology: New Latin, from Latin, feather, wing ― more at PEN
Date: 1719
1 a : a projecting body part (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