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placebo effect

[pluh-see-boh] /pləˈsi boʊ/
a reaction to a placebo manifested by a lessening of symptoms or the production of anticipated side effects.
Origin of placebo effect
First recorded in 1945-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for placebo effect

placebo effect

(med) a positive therapeutic effect claimed by a patient after receiving a placebo believed by him to be an active drug See control group
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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placebo effect in Medicine

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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