1. (直升机的)旋翼
The rotors or rotor blades of a helicopter are the four long, flat, thin pieces of metal on top of it which go round and lift it off the ground.

1. rotating mechanism consisting of an assembly of rotating airfoils

e.g. there are horizontal rotors on a helicopter or compressor rotors in a jet engine

2. the rotating armature of a motor or generator

Synonym: rotor coil

3. the revolving bar of a distributor