an inactive substance or a real medication that produces unpleasant or worsening symptoms in a patient or research participant because the person expects negative effects.
a negative symptom experienced by a person with such expectations.
Origin of nocebo
1960–65; Latin nocēbō I shall be harmful; patterned after placebo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019