|Origin:||'I shall please', from placere; PLEASE2|
pla‧ce‧bo plural placebos [countable]
a harmless substance given to a sick person instead of medicine, without telling them it is not real. Placebos are often used in tests in which some people take real medicine and others take a placebo, so that doctors can compare the results to see if the real medicine works properly.
when someone feels better after taking a placebo, even though it has not had any effect on their body