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

• weather vane
• weathervane
• wind vane

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

• blade

3. (noun) the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft

• web

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

• mechanical device

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

• fin

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

• rotating mechanism

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

• blade

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

• weathercock
• wind tee

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

• fan blade
• impeller
• paddle
• rudder blade