Longman Dictionary of Contemporary English homepage

Topic: MECHANICAL

Date: 1800-1900
Origin: rotator 'something that rotates' (17-21 centuries), from Latin, from rotare; ROTATE

rotor

noun
     
rotor
ro‧tor [countable] technical
1TEM a part of a machine that turns around on a central point
2 also rotor bladeTTA the long flat part that turns around and around on top of a helicopter
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