rotor

play
noun ro·tor \ˈrō-tər\

Definition of rotor

  1. 1a :  a part that revolves in a stationary part a brake rotorb :  the rotating member of an electrical machine

  2. 2 :  an assembly of rotating blades that supplies lift or stability for a rotorcraft

Recent Examples of rotor from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rotor'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of rotor

contraction of rotator


First Known Use: 1892


ROTOR Defined for English Language Learners

rotor

play
noun

Definition of rotor for English Language Learners

  • : a part of a machine that turns around a central point


ROTOR Defined for Kids

rotor

play
noun ro·tor \ˈrō-tər\

Definition of rotor for Students

  1. 1 :  the part of an electrical machine that turns

  2. 2 :  a system of spinning horizontal blades that support a helicopter in the air



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