vane
(noun)
noun
1. mechanical device attached to an elevated structure; rotates freely to show the direction of the wind
Definition categories: man–made
2. a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it
Definition categories: man–made, fin
3. flat surface that rotates and pushes against air or water
Similar word(s): blade
Definition categories: man–made
4. the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft
Similar word(s): web