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planet gear

noun, Machinery
1.
any of the gears in an epicyclic train surrounding and engaging with the sun gear.
Also called planet wheel.
Origin
1915-1920
1915-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for planet wheel

planet wheel

noun
1.
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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