1. Medicine/Medical, Pharmacology. a substance having no pharmacological effect but given merely to satisfy a patient who supposes it to be a medicine. a substance having no pharmacological effect but administered as a control in testing experimentally or clinically the efficacy of a biologically active preparation.
2. Roman Catholic Church. the vespers of the office for the dead: so called from the initial word of the first antiphon, taken from Psalm 114:9 o
"patients can be placebo."
"groups can be placebo."
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