vane

Noun

• the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft

• flat surface that rotates and pushes against air or water

• a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it

• mechanical device attached to an elevated structure; rotates freely to show the direction of the wind

Related words

• Synonyms: 
  web , blade , weathervane , weather vane , wind vane