'main rotor' definitions:
Definition of 'main rotor'
From: WordNet
noun
Rotor consisting of large rotating airfoils on a single- rotor helicopter that produce the lift to support the helicopter in the air
Definition of 'main rotor'
From: GCIDE
- 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]