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flywheel

[flahy-hweel, -weel] /ˈflaɪˌʰwil, -ˌwil/
noun, Machinery
1.
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
1775-1785
1775-85; fly1 + wheel
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fly-wheel

flywheel

/ˈflaɪˌwiːl/
noun
1.
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 fly-wheel

flywheel

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for fly

9
9
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