ev·a·nes·cent

[ev-uh-nes-uhnt]
adjective
1.
vanishing; fading away; fleeting.
2.
tending to become imperceptible; scarcely perceptible.

Origin:
1745–55; < Latin ēvānēscent- (stem of ēvānēscēns) vanishing, disappearing. See evanesce, -ent

ev·a·nes·cent·ly, adverb
non·ev·a·nes·cent, adjective
non·ev·a·nes·cent·ly, adverb
un·ev·a·nes·cent, adjective
un·ev·a·nes·cent·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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the act or process of putrefying; the anaerobic decomposition of organic matter by bacteria and fungi that results in obnoxiously odorous products; rotting.
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World English Dictionary
evanescent (ˌɛvəˈnɛsənt) [Click for IPA pronunciation guide]
 
adj
1.  passing out of sight; fading away; vanishing
2.  ephemeral or transitory
 
eva'nescence
 
n
 
eva'nescently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

evanescent
1717, from L. evanescentem (nom. evanescens), prp. of evanescere "disappear, vanish," from ex- "out" + vanescere "vanish."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

evanescent ev·a·nes·cent (ěv'ə-něs'ənt)
adj.
Of short duration; passing away quickly.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Although there might be an evanescent small amount of electromagnetic radiation
  there is absolutely no proof of damage by that.
It was an evanescent moment, captured in the pop of a photographer's flashbulb.
The evanescent modes decay rapidly and therefore do not propagate.
Elusive and evanescent, the rainbow has generated wonder and speculation .
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