Main Entry: ¹pin·ion

Pronunciation: \ˈpin-yən\

Function: noun

Etymology: Middle English, probably modification of Anglo-French *empignon, enpenoun flight feathers, ultimately from Vulgar Latin *pinnion-, pinnio, from Latin pinna feather — more at pen

Date: 15th century

1 : the terminal section of a bird's wing including the carpus, metacarpus, and phalanges; broadly : wing
2 : feather, quill; also : flight feathers

— pin·ioned \-yənd\ adjective