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
Braking comes in the form of DOT hydraulic brakes with six-piston calipers and large 220-mm rotors.
—
New Atlas, 15 May 2026
According to an update from the National Highway Traffic Safety Administration (NHTSA), spotted by MotorTrend, the issue pertains to the vehicle's brake rotors—the circular metal discs that spin with your car's wheels—not the wheels themselves.
—Will McCurdy, PC Magazine, 10 May 2026
In its report, the National Highway Traffic Safety Administration said that rough roads and cornering may strain the stud hole in the wheel rotor causing cracks to form and with continued driving the wheel stud could eventually separate from the wheel hub.
—ABC News, 8 May 2026
Then the engineers activated a fan inside the chamber that pelted the rotors with headwinds.
—ArsTechnica, 8 May 2026
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New Atlas, 15 May 2026
According to an update from the National Highway Traffic Safety Administration (NHTSA), spotted by MotorTrend, the issue pertains to the vehicle's brake rotors—the circular metal discs that spin with your car's wheels—not the wheels themselves.
—Will McCurdy, PC Magazine, 10 May 2026
In its report, the National Highway Traffic Safety Administration said that rough roads and cornering may strain the stud hole in the wheel rotor causing cracks to form and with continued driving the wheel stud could eventually separate from the wheel hub.
—ABC News, 8 May 2026
Then the engineers activated a fan inside the chamber that pelted the rotors with headwinds.
—ArsTechnica, 8 May 2026
See All Example Sentences for rotor
Cite this Entry
“Rotor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rotor. Accessed 21 May. 2026.
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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