placebo effect

a reaction to a placebo manifested by a lessening of symptoms or the production of anticipated side effects.

1945–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
placebo effect
med See control group a positive therapeutic effect claimed by a patient after receiving a placebo believed by him to be an active drug

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

placebo effect n.
A beneficial effect in a patient following a particular treatment that arises from the patient's expectations concerning the treatment rather than from the treatment itself.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And the folded paper cootie catchers do nothing but induce a placebo effect in
  affected persons.
And, of course, the placebo effect in medicine is well established.
Episode in which they've run out of morphine, and have to rely on the placebo
  effect on wounded soldiers.
It is also possible that your recovery was due to the placebo effect instead of
  the acupuncture itself.
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