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

Stopping power is provided by dual-piston hydraulic disc brakes with 180-mm rotors. —Paul Ridden, New Atlas, 18 Mar. 2025

Beyond the dual powertrains, the LMX is loaded with high-grade MTB kit, including oversized Formula Cura hydraulic twin-piston disc brakes with 203mm rotors, a long-travel (170mm) adjustable RockShox ZEB fork, and a Rockshox Vivid R2C rear suspension with 180mm of travel. —William Roberson, Forbes, 17 Mar. 2025

Tektro hydraulic disc brakes with a 180-mm rotor up front and a 203-mm rotor in back make for effective stopping power. —Paul Ridden, New Atlas, 12 Mar. 2025

Three flight settings up to 200ft and helicopter-like rotor blades extend to ensure a safe landing. —Paul Brett, Space.com, 28 Feb. 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