Definition of rotor noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈrəʊtə(r)//
; NAmE NAmE//ˈroʊtər//
How machines work
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a part of a machine that turns around a central point rotor blades on a helicopter See related entries: How machines work Word Originearly 20th cent.: formed irregularly from rotator.
See the Oxford Advanced American Dictionary entry: rotor