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

Among the more popular is the Vampire drone, a heavy bomber with six rotors, which can be redeemed for 43 points. —Simon Shuster, Time, 24 Sep. 2025

The compact helicopter lifted off smoothly as Rumsey guided the nose northward, with its contra-rotating rotors humming steadily above him. —Sujita Sinha, Interesting Engineering, 21 Sep. 2025

The basic components of a wind turbine are the visible tower and rotor blades, as well as the gearbox and generator located at the top of the tower. —Karl Schneider, IndyStar, 21 Sep. 2025

The two other pilots man large Vampire systems with six rotors, capable of flying further and carrying heavier payloads. —Tamar Jacoby, Forbes.com, 19 Sep. 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