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emanation

[em-uh-ney-shuh n] /ˌɛm əˈneɪ ʃən/
noun
1.
an act or instance of emanating.
2.
something that emanates or is emanated.
3.
Physical Chemistry. a gaseous product of radioactive disintegration, including radon, thoron, and actinon. Symbol: Em.
Origin
1560-1570
1560-70; < Late Latin ēmānātiōn- (stem of ēmānātiō), equivalent to ēmānāt(us) (see emanate) + -iōn- -ion
Related forms
emanational, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for emanations

emanation

/ˌɛməˈneɪʃən/
noun
1.
an act or instance of emanating
2.
something that emanates or is produced; effusion
3.
a gaseous product of radioactive decay, such as radon
Derived Forms
emanational, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for emanations

emanation

n.

1560s, from Late Latin emanationem (nominative emanatio), noun of action from past participle stem of Latin emanare "flow out, arise, proceed," from ex- "out" (see ex-) + manare "to flow," from PIE root *ma- "damp."

Online Etymology Dictionary, © 2010 Douglas Harper
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emanations in Medicine

emanation em·a·na·tion (ěm'ə-nā'shən)
n.

  1. Something that issues from a source; an emission.

  2. Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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