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nocebo

[noh-see-boh]
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noun
  1. 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.
  2. a negative symptom experienced by a person with such expectations.
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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. 2018