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[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.
Origin of flywheel
1775-85; fly1 + wheel Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for flywheel
  • Efforts to integrate storage into electric grids continue to struggle as a federally backed flywheel company goes bankrupt.
  • My favorite battery tech at the moment is the flywheel.
  • Electric flywheel technology, which can be bought today, should be put in areas to stop power dips and surges.
  • He stood rubbing her back in the manner of someone trying to set a flywheel right.
  • Or flywheel bicycles, motorcycles or even airplanes.
  • The flywheel of technology proliferation and jerkiness syncopates to open up new frontiers of opportunity for humanity.
  • Regenerative braking creates the electric power, which is stored with a flywheel.
  • In a flywheel system, energy from the wheels is used to spin a flywheel at high speeds.
  • Instead, the drive shaft is connected directly to a large metal flywheel.
  • The motorcycle wheel would set the flywheel turning at high speed.
British Dictionary definitions for flywheel


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
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Word Origin and History for flywheel

1784, from fly (n.) "speed-regulating device" (from fly (v.1)) + wheel (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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