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View synonyms for

side effect

or -·ڱ𳦳

noun

  1. 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.
  2. any accompanying or consequential and usually detrimental effect:

    the side effects of air pollution.



side effect

noun

  1. any unwanted nontherapeutic effect caused by a drug Compare aftereffect
  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 History and Origins

Origin of side effect1

First recorded in 1880–85
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Example Sentences

Examples have not been reviewed.

Chelation therapy is no joke, either, and can cause serious side effects and kidney damage.

From

A recent adverse side effect to the cancer treatment saw the King have a brief hospital stay, but that was described as a minor setback in a bigger picture of positive progress.

From

The visit comes after the King had recently spent a short time in hospital over temporary side effects from his cancer treatment.

From

He had a brief stay in hospital after suffering side effects from his cancer treatment, but was well enough to return to a series of engagements last week.

From

Last month, she was readmitted with gut issues, a common side effect of stem cell transplants, but blood tests "showed active disease".

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