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

Additionally, EVs use regenerative braking, which reduces wear on brake pads and rotors. —Danny Smith, USA Today, 29 May 2026

Six rotor rows handle vertical thrust during takeoff and landing, while the wings generate lift in cruise. —Omar Kardoudi may 27, New Atlas, 27 May 2026

Finally, Ford integrated the magnets into its EV motor rotors for durability testing. —Aman Tripathi, Interesting Engineering, 20 May 2026

In March, engineers at NASA's Jet Propulsion Laboratory (JPL) in Southern California completed tests on rotor designs that could be used to fly those drones, spinning the experimental helicopter blades fast enough for their tips to exceed Mach 1 (the speed of sound). —Josh Dinner, Space.com, 17 May 2026

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
• coater
• floater
• motor
• voter
• locomotor
• psychomotor
• servomotor
• vasomotor
• oculomotor
• sensorimotor
• premotor

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