noun
a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
• Syn: ↑epicyclic train
• Hypernyms: ↑gearing, ↑gear, ↑geartrain, ↑power train, ↑train
• Part Meronyms: ↑planetary gear, ↑epicyclic gear, ↑planet wheel, ↑planet gear, ↑sun gear
Useful english dictionary. 2012.