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

With its twin rotors, the Chinook is still the fastest helicopter in the Army. —Tom Vanden Brook, USA Today, 14 June 2025

It's powered by eight individual electric rotors wired to a multi-battery pack. —New Atlas, 12 June 2025

Because the brake system is used less often, EV brake pads and rotors tend to last much longer than those on gas cars. —Melanie Marshall, San Diego Union-Tribune, 12 June 2025

Triumph Daytona 955 forks and 320 mm floating rotors comprise the front end, while laced rims and a rear drum brake are reminiscent of historic race bikes, as is the straight-pipe exhaust. —Robert Ross, Robb Report, 11 June 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