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rotor

noun
🔊/ˈrəʊtə(r)/
🔊/ˈrəʊtər/
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  1. a part of a machine that turns around a central point（机器的）转子，转动部件
    • rotor blades on a helicopter直升机的旋翼桨叶
    Topics Engineeringc2
    Oxford Collocations DictionaryRotor is used before these nouns:
    • blade
    See full entry
    Word Originearly 20th cent.: formed irregularly from rotator.