vane
名词 vane:
flat surface that rotates and pushes against air or water
同义词:blade
mechanical device attached to an elevated structure; rotates freely to show the direction of the wind
同义词:weathervane, weather vane, wind vane
a metal fin attached to the tail of a bomb or missile in order to stabilize or guide it
the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft
同义词:web