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side effect

any effect of a drug, chemical, or other medicine that is in addition to its intended effect, especially an effect that is harmful or unpleasant.
any accompanying or consequential and usually detrimental effect:
the side effects of air pollution.
Also, side-effect.
Origin of side effect
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for side effect
  • Furthermore, the satellite measurements have helped flag a worrying side effect of excessive groundwater extraction.
  • Germ theory, which secularized infectious disease, had a side effect: it sacralized epidemiology.
  • In fact, such image correction is merely a side effect of what is genuinely different about the technology.
  • The side effect is that whatever is on the oven floor cooks extremely quickly.
  • These creatures had not died as a side effect of agriculture.
  • Ala, one little side effect could be that all the bio living things could become its food source for its perpetuation.
  • The side effect is that if the original poster keeps posting that the bot will also keep posting.
  • One unfortunate side effect of this system is that if you find a new weapon while adventuring, you have no choice but to equip it.
  • The side effect of the process is that the coil expands and explodes violently inside the chamber.
  • Curbing the excesses of wealth, then, will be a side effect of regulations designed to make capitalism work better.
British Dictionary definitions for side effect

side effect

any unwanted nontherapeutic effect caused by a drug Compare aftereffect (sense 2)
any secondary effect, esp an undesirable one
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for side effect

also side-effect, 1884, from side (adj.) + effect (n.). Medical use, with reference to drugs, is recorded from 1939.

Online Etymology Dictionary, © 2010 Douglas Harper
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side effect in Medicine

side effect n.
A peripheral or secondary effect, especially an undesirable secondary effect of a drug or therapeutic regimen.

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