American English

Definition of placebo noun from the Oxford Advanced American Dictionary

 

placebo

 noun
noun
NAmE//pləˈsiboʊ//
 
(pl. placebos)
 
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a substance that has no physical effects, given to patients who do not need medicine but think that they do, or used when testing new drugs the placebo effect (= the effect of taking a placebo and feeling better)
See the Oxford Advanced Learner's Dictionary entry: placebo