from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A rotating part of an electrical or mechanical device.
  • n. An assembly of rotating horizontal airfoils, as that of a helicopter.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rotating part of a mechanical device, for example in an electric motor, generator, alternator or pump.
  • n. The wing of a helicopter or similar aircraft

from the GNU version of the Collaborative International Dictionary of English

  • n. The rotating part of a generator or motor. Contrasted with stator, the stationary part.

from The Century Dictionary and Cyclopedia

  • n. A quantity having magnitude, direction, and position.
  • n. In electricity, the revolving element of an electric machine.
  • n. The revolving part of a steam-turbine. It consists of the shaft and the disks carrying the buckets on which the steam pressure acts.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. rotating mechanism consisting of an assembly of rotating airfoils
  • n. the revolving bar of a distributor
  • n. the rotating armature of a motor or generator


from The American Heritage® Dictionary of the English Language, 4th Edition

Contraction of rotator.


  • When the rotor is straight, the brakes will work better and your quad may even be slightly faster, as rolling resistance will be eliminated.

    Tip of the Day: Brake Fix

  • I crashed it dozens of times, the last of which caused the main rotor to snap beyond repair.

    Attack co-workers with your own chopper! | Sync Blog

  • Although an efficiently simple design, the tiny size of the motor (e.g., each rotor is 20 micrometers in diameter) required special fabrication techniques.

    Incredible Motor Powered By Living Bacteria | Impact Lab

  • This blew a semicircle out of the main rotor spar, but the blade held together long enough for them to finish putting in the medics and Rangers at the first crashsite.

    Michael J. Durant

  • As they headed to the airfield all 7 gallons of oil from the main rotor gearbox, and all 7 quarts from each engine was pouring out.

    Michael J. Durant

  • They were about 1500 feet above the ground when the explosion occurred, separating the tail boom and one main rotor blade from the aircraft.

    McKain, Bobby L.

  • He stated that he saw the main rotor blade come off as the helicopter tried to extract the rest of the team.

    Watson, Ronald L.

  • The helicopter apparently lost its main rotor on impact with the ground.

    Black, Paul V.

  • Worthington's helicopter skid had struck the main rotor of his helicopter.

    Hernandez, Frank S.

  • The UH1B lost it's main rotor system and severed the tail boom of the OH6A.

    Butler, Dewey R.


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