• 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.
  • One of the metal guidance or stabilizing fins attached to the tail of a bomb or other missile.
  • (countable) A weather vane.
  • A sight on a sextant or compass.
  • (ornithology) The flattened, web-like part of a feather, consisting of a series of barbs on either side of the shaft.

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