(n) 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
The Collaborative International Dictionary of English (GCIDE) v.0.53
‖n. [ L., I shall please, fut. of placere to please. ] 1. (R. C. Ch.) The first antiphon of the vespers for the dead. [ 1913 Webster ]
2. (Med.) A prescription with no pharmacological activity given to a patient to humor or satisfy the desire for medical treatment. [ 1913 Webster ]
3. (Med.) a dose of a compound having no pharmacological activity given to a subject in a medical experiment as part of a control experiment in a test of the effectiveness of another, active pharmacological agent. [ PJC ]
To sing placebo, to agree with one in his opinion; to be complaisant to. Chaucer. [ 1913 Webster ]
‖n. (Med.) a reaction by a patient who receives a placebo{ 2 }, in which the symptoms of illness are lessened or an anticipated effect is experienced. Because the placebo{ 2 } itself has no pharmacological activity, this reaction is mediated by the expectations of the patient receiving the placebo{ 2 }; the reaction is considered as an example of the power of suggestion. Dramatic subjective effects such as relief of discomfort or pain are sometimes observed due to administration of a placebo, but in some cases measurable physiological effects may also be observed. [ PJC ]
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