Etymology
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vane (n.)

"plate metal wind indicator," early 15c., southern England alteration (see V) of fane "flag, banner."

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Definitions of vane

vane (n.)
mechanical device attached to an elevated structure; rotates freely to show the direction of the wind;
Synonyms: weathervane / weather vane / wind vane
vane (n.)
a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it;
vane (n.)
flat surface that rotates and pushes against air or water;
Synonyms: blade
vane (n.)
the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft;
Synonyms: web
From wordnet.princeton.edu