rotor

noun

ro·​tor ˈrō-tər 

1

a

: a part that revolves in a stationary part

a brake rotor

b

: the rotating member of an electrical machine

2

: an assembly of rotating blades that supplies lift or stability for a rotorcraft

Examples of rotor in a Sentence

Recent Examples on the Web

Each rotor operates independently, providing redundancy in the event of motor failure. —Kaif Shaikh, Interesting Engineering, 4 Nov. 2025

The helicopter’s fuselage and main rotor blades sustained substantial damage in the crash, according to the NTSB report. —Rosalio Ahumada, Sacbee.com, 4 Nov. 2025

The pilot, who holds an Airline Transport Pilot certificate and multiple commercial ratings, attempted an emergency maneuver with the rotors when the engine cut out, but that was unsuccessful and resulted in a hard landing, according to authorities. —Shannon Tyler, Idaho Statesman, 22 Oct. 2025

Effective stopping power is provided by Tektro HD-M275 hydraulic disc brakes with 160-mm rotors. —New Atlas, 22 Oct. 2025

Word History

Etymology

contraction of rotator

First Known Use

1892, in the meaning defined at sense 1a

Phrases Containing rotor

• tilt-rotor

Rhymes for rotor

• boater
• floater
• motor
• voter
• locomotor
• psychomotor
• servomotor
• vasomotor
• oculomotor
• sensorimotor
• premotor
• promoter

Kids Definition

rotor

noun

ro·​tor ˈrōt-ər 

1

: a part that rotates in a stationary part (as in an electrical machine)

2

: a complete system of rotating blades that support a helicopter in flight