1. （靠风力或水力驱动机器的)翼，叶片，轮叶
A vane is a flat blade which pushes or is pushed by wind or water, and forms part of a machine such as a fan, a windmill, or a ship's propeller.

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

Synonym: web

2. flat surface that rotates and pushes against air or water

Synonym: blade

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

4. mechanical device attached to an elevated structure
rotates freely to show the direction of the wind

Synonym: weathervaneweather vanewind vane