1. (noun)weathervane, weather vane, vane, wind vane mechanical device attached to an elevated structure; rotates freely to show the direction of the wind Synonyms: blade, windvane, web, vane, weathervane, weathervane
2. (noun)vane a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it Synonyms: blade, windvane, web, weathervane, weathervane