flywheel
[ flahy-hweel, -weel ]
/ ˈflaɪˌʰwil, -ˌwil /
noun Machinery.
a heavy disk or wheel rotating on a shaft so that its momentum gives almost uniform rotational speed to the shaft and to all connected machinery.
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British Dictionary definitions for flywheel
flywheel
/ (ˈflaɪˌwiːl) /
noun
a heavy wheel that stores kinetic energy and smooths the operation of a reciprocating engine by maintaining a constant speed of rotation over the whole cycle