From Longman Dictionary of Contemporary Englishflywheelfly‧wheel /ˈflaɪwiːl/ noun [countable] Ta heavy wheel that keeps a machine working at a steady speed
Examples from the Corpus
flywheel• Instead, in an ingenious way, it uses a flywheel generator.• He fell into a big flywheel.• A bright green flywheel with decorated spokes.• His thoughts tended to be deflected away, as if from a fast-running flywheel.• He was fearful that the bearings might seize; if that happened, the spinning flywheel would tear the ship to pieces.• New Scientist took up some original thought on an old idea, the flywheel, which can store energy with high efficiency.• At night, the rotational energy of these flywheels could be tapped to run generators. 