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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 1st to talk about placebo effects but now the idea has been generalized to many situations having nothing to do with drugs


phenomenon noun (natural phenomena)


placebo effects

Original source:

Princeton WordNet

Definition references  (+images)


Placebo | SEE | placebo effect

a simulated or otherwise medically ineffectual treatment for a disease or other medical condition intended to deceive the recipient. Sometimes patients given a placebo treatment will have a perceived or actual improvement in a medical condition, a ... (37 of 12875 words, pronunciation, 2 images)


Placebo effect (disambiguation)

may refer to: Placebo effect, the tendency of any medication or treatment, even an inert or ineffective one, to exhibit results simply because the recipient believes that it will work | Placebo Effect (Doctor Who), an original novel written by Gary ... (40 of 131 words, 4 definitions)

en​.wikipedia​.org​/wiki​/Placebo effect (disambiguation)

Britannica Encyclopedia:

placebo effect | nonspecific effect [synonym]

psychological or psychophysiological improvement attributed to therapy with an inert substance or a simulated procedure. There is no clear explanation ... (20 of 697 words)


Collins Dictionary:

placebo effect [medicine] | control group [synonym]

a positive therapeutic effect claimed by a patient after receiving a placebo believed by him to be an active drug (20 of 337 words, 6 usage examples)


Oxford Dictionary:

placebo effect

a beneficial effect produced by a placebo drug or treatment, which cannot be attributed to the properties of the placebo itself, and must therefore be ... (25 of 65 words, 1 usage example)


Macmillan British Dictionary:

placebo effect [countable, medical] | placebo effects [plural]

improvement in an ill person's condition when they have been given a placebo instead of real medicine (17 of 47 words)



placebo effect

improvement in the condition of a patient that occurs in response to treatment but cannot be considered due to the specific treatment used (23 of 37 words)

www​.merriam-webster​.com​/dictionary​/placebo effect

American Heritage Dictionary:

placebo effect

The beneficial effect in a patient following a particular treatment that arises from the patient's expectations concerning the treatment rather than ... (21 of 28 words)



placebo effect [pharmacology] | placebo effects [plural]

The tendency of any medication or treatment, even an inert or ineffective one, to exhibit results simply because the recipient believes that it will work. (25 of 27 words)

en​.wiktionary​.org​/wiki​/placebo effect

New World Dictionary:

placebo effect

an improvement in a person's medical condition regarded as the effect of the person's belief in the effectiveness of the treatment used (22 of 24 words)


Random House Dictionary:

placebo effect

a reaction to a placebo manifested by a lessening of symptoms or the production of anticipated side effects. (18 of 23 words, pronunciation)


Cambridge Dictionary:

the upshot | upshot

something which happens as a result of other actions, events or decisions (12 of 29 words, 1 usage example, pronunciations)


Encarta Dictionary:

placebo effect | placebo effects [plural]

a sense of benefit felt by a patient that arises solely from the knowledge that treatment has been given (19 of 32 words)

encarta​.msn​.com​/dictionary 1861726595​/definition​.html  [offline]

Audio references

Macmillan British Dictionary:

placebo effect [countable, medical] | placebo effects [plural]

Audio: British English pronunciation of "placebo effect"


Macmillan American Dictionary:

placebo effect [countable, medical] | placebo effects [plural]

Audio: North American pronunciation of "placebo effect"


Google Dictionary:

placebo effect | placebo effects [plural]

Audio: English pronunciation of "placebo effect"

www​.google​.com​/#hl=en&tbs=dfn​:1&fp=1&q=placebo effect

YourDictionary Audio:

placebo effect

Audio: North American English pronunciation of "placebo effect" by speech synthesizer


Page last updated: 2013-06-26

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