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1. Oxford American Dictionary

   flywheel

   • IPA[ˈflīˌ(h)wēl]

   美式

   • n.
     a heavy revolving wheel in a machine that is used to increase the machine's momentum and thereby provide greater stability or a reserve of available power during interruptions in the delivery of power to the machine.

   • noun: flywheel, plural noun: flywheels