Dictionary
2 ENTRIES FOUND:

flywheel

noun fly·wheel \-ˌhwēl, -ˌwēl\

: a heavy wheel that is part of a machine and that controls the speed of machinery

Full Definition of FLYWHEEL

:  a heavy wheel for opposing and moderating by its inertia any fluctuation of speed in the machinery with which it revolves; also :  a similar wheel used for storing kinetic energy (as for motive power)

First Known Use of FLYWHEEL

1784

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