American Heritage® Dictionary of the English Language, Fourth Edition
- n. A system of gears in which at least one rotating gear revolves about another.
GNU Webster's 1913
- adj. (Mach.) a train of mechanism in which epicyclic motion is involved; esp., a train of spur wheels, bevel wheels, or belt pulleys, in which an arm, carrying one or more of the wheels, sweeps around a center lying in an axis common to the other wheels.
- n. a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
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