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

Using nearly 1,700 hours of training data and 1,800 real-world trials, these systems demonstrated the ability to handle complex manipulation tasks, from assembling a breakfast tray to installing a bicycle brake rotor. —Jijo Malayil, Interesting Engineering, 15 Apr. 2026

Newton promptly stopped the fundraiser and set the rotor blades in motion. —Madison Dapcevich, Outside, 31 Mar. 2026

Powered by a micro-rotor, the automatic caliber offers an impressive 60-hour power reserve, too. —Rachel Cormack, Robb Report, 31 Mar. 2026

To perform forward motion, the two rear rotors increase speed while the front rotors simultaneously reduce speed, creating an imbalance that tilts the drone and propels it forward. —Etiido Uko march 30, New Atlas, 30 Mar. 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
• 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