- noun a liquid or tablet that appears to be a drug but has no medicinal substance in it
- noun a tablet that appears to be a drug but has no medicinal substance in it, used in tests and trials
(written as Placebo)A non-active apparent treatment used in a clinical trial that is in appearance indistinguishable from the active treatment being investigated. The idea is to identify the effect of the specific treatment under investigation as distinct from 'treatment' in a general sense. From the Latin meaning 'I will please'.