Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A peripheral or secondary effect, especially an undesirable secondary effect of a drug or therapy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An unintended consequence of any action in addition to the intended consequence of that action.
  • n. An adverse effect, an unintended consequence of a drug or therapy; usually not a beneficial effect.
  • n. A change in state caused by a function call (typically "side-effect").

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any adverse and unwanted secondary effect
  • n. a secondary and usually adverse effect of a drug or therapy

Etymologies

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