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

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

Equipped with advanced turboshaft engines, high-efficiency rotor systems, and anti-icing technology, the military variants of the Z-20 are built for demanding operational conditions. —Bojan Stojkovski, Interesting Engineering, 19 Oct. 2025

Some videos of the crash circulating on social media appear to show the tail rotor slowing down and coming to a stop as the helicopter starts to spin to the right. —Nathaniel Percy, Oc Register, 16 Oct. 2025

The logo, hands, indexes, and rotor are trimmed in British racing green—the color of the legendary car brand. —Carol Besler, Robb Report, 3 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