fly·wheel

[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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
flywheel (ˈflaɪˌwiːl) [Click for IPA pronunciation guide]
 
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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00:10
Flywheel is always a great word to know.
So is gobo. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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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Example sentences
Regenerative braking creates the electric power, which is stored with a
  flywheel.
If the flywheel becomes distorted as a result of such removal, the flywheel may
  be subject to stress and vibration.
After starting the flywheel, the weighted, inner wheel begins spinning and the
  bike is stable and ready to ride.
He stood rubbing her back in the manner of someone trying to set a flywheel
  right.
Image for flywheel
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