VANE

Definition

1. noun mechanical device attached to an elevated structure. — synonyms: weathervane, weather_vane, wind_vane
2. noun a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it.
3. noun flat surface that rotates and pushes against air or water. — synonyms: blade
4. noun the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft. — synonyms: web