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WordReference Random House Unabridged Dictionary of American English © 2024ep′icy′clic train′, [Mach.]- Mechanical Engineeringa train of gears or pulleys in which one or more of the axes revolve about a central axis.
Collins Concise English Dictionary © HarperCollins Publishers:: epicyclic train n - a cluster of gears consisting of a central gearwheel with external teeth (the sun), a coaxial gearwheel of greater diameter with internal teeth (the annulus), and one or more planetary gears engaging with both of them to provide a large gear ratio in a compact space
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