fly-wheel

flywheel

[flahy-hweel, -weel]
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:
1775–85; fly1 + wheel

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World English Dictionary
flywheel (ˈflaɪˌwiːl)
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

flywheel
1784, from fly (n.) "speed-regulating device" (from fly (v.1)) + wheel.
Online Etymology Dictionary, © 2010 Douglas Harper
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