- 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.
Origin of flywheel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for flywheel
The flywheel is held to the crank-shaft by means of a set-screw S.
The momentum of the flywheel A pushes the piston upward, closing these holes.
Nothing now remains to be made except the crank and the flywheel.
A flywheel keeps an engine going between the strokes of the piston.Common Science
Carleton W. Washburne
Mr. Hastings helped him, but after a few turns of the flywheel there were no explosions.Tom Swift and his Motor-boat
- 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for flywheel
Online Etymology Dictionary, © 2010 Douglas Harper