epicyclic gear

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Related to Epicyclic gearing: epicyclic gear train

epicyclic gear

[¦ep·ə¦sī·klik ′gir]
(mechanical engineering)
A system of gears in which one or more gears travel around the inside or the outside of another gear whose axis is fixed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.