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One of the small gear wheels in an epicyclic train.
(Mechanical Engineering) any one of the wheels of an epicyclic gear train that orbits the central axis of the train
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|Noun||1.||planet wheel - an outer gear that revolves about a central sun gear of an epicyclic train|
epicyclic gear train, epicyclic train - a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis