Definition - vanes

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