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planet gear

noun, Machinery.
any of the gears in an epicyclic train surrounding and engaging with the sun gear.
Also called planet wheel.
Origin of planet gear
First recorded in 1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for planet wheel

planet wheel

any one of the wheels of an epicyclic gear train that orbits the central axis of the train
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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