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

Despite the rotor blades, the façade also consists of pollinator-friendly plants. —Georgina Jedikovska, Interesting Engineering, 16 Dec. 2025

Air is thinner at extreme altitudes, providing less lift for a helicopter’s rotors. —Ben Ayers, Outside, 15 Dec. 2025

Do yourself a favor and take the time to properly inspect the machine, tighten any fasteners, check for wear on the rotor paddles, scrapers, and skid shoes, and ensure that the auger and chute are free of obstructions. —Timothy Dale, Better Homes & Gardens, 11 Dec. 2025

This can be countered with skewed propeller blades to distribute pressure evenly, pump jets where a rotor is set inside a shroud to muffle noises, or low-RPM, high-torque designs to cut down on vibrations. —New Atlas, 7 Dec. 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