A flat piece of material that is moved by wind or water and is used to indicate direction or to measure speed. The weather vane on top of the barn spun wildly during the storm.
A blade or surface that is part of a machine, such as a turbine or fan, that moves or is moved by air or fluid. The engineer inspected the vanes of the turbine for any signs of wear.
A feather or a similar structure on an arrow or dart that stabilizes its flight. The archer carefully adjusted the vanes on his arrows to ensure accuracy.
Either of the flattened webs extending from the shaft of a feather. The owl’s soft feather vanes allow it to fly almost silently.