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

Definition categories: man–made

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

Definition categories: man–made, fin

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

Similar word(s): blade

Definition categories: man–made

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

Similar word(s): web

Definition categories: animal, blade