vanes

[weathervane.n.01] as in: mechanical device attached to an elevated structure; rotates freely to show the direction of the wind

[vane.n.02] as in: a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it

[blade.n.08] as in: flat surface that rotates and pushes against air or water

[vane.n.04] as in: the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft

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