rotor Hear it!

rotor definition

ro·tor (rōt′ər)

noun

  1. any of various rotating mechanical parts; specif.,
    1. the rotating part of a motor, dynamo, etc.
    2. in the distributor of a gasoline engine, the part that momentarily connects each spark plug wire to the high voltage from the coil
    3. in disc brakes, the part to which the wheel is usually mounted
  2. a system of airfoils, together with their hub, that rotates around a vertical axis, as on a helicopter

Etymology: contr. of rotator

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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