verb (used with object)
to slake, satisfy, or allay (thirst, desires, passion, etc.).
to put out or extinguish (fire, flames, etc.).
to cool suddenly by plunging into a liquid, as in tempering steel by immersion in water.
to subdue or destroy; overcome; quell: to quench an uprising.
Electronics. to terminate (the flow of electrons in a vacuum tube) by application of a voltage.

1150–1200; Middle English quenchen, earlier cwenken; compare Old English -cwencan in ācwencan to quench (cf. a-3)

quenchable, adjective
quenchableness, noun
quencher, noun
unquenchable, adjective
unquenched, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quench (kwɛntʃ)
1.  to satisfy (one's thirst, desires, etc); slake
2.  to put out (a fire, flame, etc); extinguish
3.  to put down or quell; suppress: to quench a rebellion
4.  to cool (hot metal) by plunging it into cold water
5.  physics to reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance
6.  electronics
 a.  to suppress (sparking) when the current is cut off in an inductive circuit
 b.  to suppress (an oscillation or discharge) in a component or device
[Old English ācwencan to extinguish; related to Old Frisian quinka to vanish]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. acwencan "to quench" (of fire, light), from P.Gmc. *cwandjan, probably a causative form of root of O.E. cwincan "to go out, be extinguished," O.Fris. kwinka.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Science is nothing more than satisfying an unquenchable need to know.
Even colleges, with their unquenchable thirst for higher tuition, were unlikely
  to beat that.
It takes an unquenchable curiosity and a monomaniacal sense of purpose.
The unquenchable desire to prove yourself better than everyone else.
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