Planet-wheel meaning

One of the small gear wheels in an epicyclic train.
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A gear that meshes with and revolves around another gear in an epicyclic train.
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A gear wheel that revolves around the wheel with which it meshes, in an epicyclic train.
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Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
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