planet gear

Noun
  1. An outer gear that revolves about a central sun gear of an epicyclic train (synset 103962607)
    is a type of: cogwheel, gear, gear wheel, geared wheel - a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
    is a part of: epicyclic gear train, epicyclic train - a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
    same as: epicyclic gear, planet wheel, planetary gear

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