vane

Etymology

From Middle English vane, Southern Middle English variant of fane, from Old English fana (“cloth, banner, flag”), from Proto-West Germanic *fanō, from Proto-Germanic *fanô. Cognate with Saterland Frisian Foone (“flag, banner”), Dutch vaan (“banner, flag”), German Low German Fahn (“flag”), German Fahne. Compare obsolete fane (“weathercock”).

noun

1. A weather vane.
2. Any of several usually relatively thin, rigid, flat, or sometimes curved surfaces radially mounted along an axis, as a blade in a turbine or a sail on a windmill, that is turned by or used to turn a fluid.
3. (ornithology) The flattened, web-like part of a feather, consisting of a series of barbs on either side of the shaft.
   Meronym: barb
4. (navigation) A sight on a sextant or compass.
5. (weaponry) One of the metal guidance or stabilizing fins attached to the tail of a bomb or other missile.