radio active fallout

radioactive fallout

noun
See under fallout.
Dictionary.com Unabridged

fallout

[fawl-out]
noun
1.
the settling to the ground of airborne particles ejected into the atmosphere from the earth by explosions, eruptions, forest fires, etc., especially such settling from nuclear explosions (radioactive fallout) Compare rainout.
2.
the particles themselves. Compare rainout.
3.
an unexpected or incidental effect, outcome, or product: the psychological fallout of being obese.
4.
effects; results: emotional fallout from a divorce.
Also, fall-out.


Origin:
1945–50; noun use of verb phrase fall out

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
fallout (ˈfɔːlˌaʊt)
 
n
1.  the descent of solid material in the atmosphere onto the earth, esp of radioactive material following a nuclear explosion
2.  any solid particles that so descend
3.  informal side-effects; secondary consequences
 
vb
4.  informal to quarrel or disagree
5.  (intr) to happen or occur
6.  military to leave a parade or disciplinary formation
 
sentence substitute
7.  military the order to leave a parade or disciplinary formation

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

fallout
"radioactive particles," 1950, from fall (v.) + out.
Online Etymology Dictionary, © 2010 Douglas Harper
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