main rotor

from WordNet (r) 3.0 (2006)

main rotor
    n 1: rotor consisting of large rotating airfoils on a single-
         rotor helicopter that produce the lift to support the
         helicopter in the air

from The Collaborative International Dictionary of English v.0.48

main rotor \main rotor\ n. (Aviation)
   The assembly of large rotating airfoils (blades) on a
   helicopter that produce the lift to support the helicopter in
   the air.
   [WordNet 1.5]

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