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planeload
planer
planer tree
planet
planet wheel
planetar
planetarium
planetary
planetary gear
planetary nebula
planetesimal
planetoid
planetology
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planetary gear
plan·e·tar·y gear (plural plan·e·tar·y gears)


noun 
Definition:
 
gear rotating around central gear: a gearwheel, especially in an epicyclic train, that travels around another, usually central gearwheel
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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