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
Three flight settings up to 200ft and helicopter-like rotor blades extend to ensure a safe landing.
—
Paul Brett, Space.com, 28 Feb. 2025
Quadcopters change speed and direction simply by altering the speed of specific rotors under direction of a flight controller.
—David Hambling, Forbes, 25 Feb. 2025
That included the right engine and tail rotor, the NTSB said on Thursday.
—Jeanine Santucci, USA TODAY, 10 Feb. 2025
Among the pieces still missing are the Black Hawk’s right engine and tail rotor.
—Alexandra Skores, CNN, 8 Feb. 2025
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Paul Brett, Space.com, 28 Feb. 2025
Quadcopters change speed and direction simply by altering the speed of specific rotors under direction of a flight controller.
—David Hambling, Forbes, 25 Feb. 2025
That included the right engine and tail rotor, the NTSB said on Thursday.
—Jeanine Santucci, USA TODAY, 10 Feb. 2025
Among the pieces still missing are the Black Hawk’s right engine and tail rotor.
—Alexandra Skores, CNN, 8 Feb. 2025
See All Example Sentences for rotor
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Cite this Entry
“Rotor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rotor. Accessed 9 Mar. 2025.
Copy CitationKids 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
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