rotor
nounUK /ˈrəʊ.tər/
US /ˈroʊ.tɚ/
A rotor is a part that spins around in a machine.
The helicopter's rotor spun fast as it lifted off the ground.
OTHER MEANINGS
2. The spinning part of a helicopter that lifts it into the air.
The rescue helicopter's rotor kicked up dust as it landed.
3. A spinning part inside an electric motor or generator.
The mechanic replaced the worn rotor in the electric motor.
4. A system of rotating blades in a machine such as a turbine.
Steam pushed the turbine's rotor around at high speed.