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One of the small gear wheels in an epicyclic train.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(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
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