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Definitions of placebo
  1. noun
    an innocuous or inert medication; given as a pacifier or to the control group in experiments on the efficacy of a drug
  2. noun
    (Roman Catholic Church) vespers of the office for the dead
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Definition that contains placebo
  • active placebo a placebo used in experimental tests of a drug that has noticeable side effects
  • placebo effect any effect that seems to be a consequence of administering a placebo; the change is usually beneficial and is assumed result from the person's faith in the treatment or preconceptions about what the experimental drug was supposed to do; pharmacologists were the first to talk about placebo effects but now the idea has been generalized to many situations having nothing to do with drugs
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