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

The Zenith Caliber 400z has, of course, been given the Parmigiani treatment, with a gorgeous gold guilloche rotor and other fancy flourishes. —Rachel Cormack, Robb Report, 25 Feb. 2026

Mechanically, the As2 features 12 degrees of freedom driven by low-inertia, high-speed inner rotor PMSM motors. —Neetika Walter, Interesting Engineering, 24 Feb. 2026

The box-wing concept requires a more complex interconnected shaft system, allowing the engines to transfer power between the main rotor and the lateral propellers. —David Szondy february 24, New Atlas, 24 Feb. 2026

The front rotors are 14.6 in diameter up front, 14.2 in back, and massive four-piston calipers bite down on the former. —Peter Nelson, Forbes.com, 20 Jan. 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