| NOUN | artifact | sun gear | the central gear in an epicyclic train |
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| Meaning | The central gear in an epicyclic train. | |
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| Part of | epicyclic train, epicyclic gear train | A system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis |
| Broader | gear, gear wheel, geared wheel, cogwheel | A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion |
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