1. An arm of a propeller or a rotating wing.
  2. Specifically, restrictive, that part of a propeller arm or of a rotating wing from the shank outward, i.e., that part having an efficient airfoil shape and that cleaves the air. See blade shank.
  3. A vane (in sense 2), such as a rotating vane or stationary vane in a rotary air compressor, or a vane of a turbine wheel.

See also: Blade Passing Frequency.

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Subjects: Mechanical Engineering