vane

/vˈeɪn/

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Definitions

Noun
mechanical device attached to an elevated structure; rotates freely to show the direction of the wind
Noun
a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it
Noun
flat surface that rotates and pushes against air or water
Noun
the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft