nocebo.
A substance which a patient experiences as harmful due to a previous negative perception, but which is in fact pharmacologically (medicinally) inactive.
Meaning & usage
A substance which a patient experiences as harmful due to a previous negative perception, but which is in fact pharmacologically (medicinally) inactive.
Where this word comes from
Borrowed from Latin nocēbō (“I will harm”), the first-person singular future active indicative form of noceō (“to harm”), by analogy with placebo. The word was coined by Walter P. Kennedy in an article entitled “The Nocebo Reaction” (1961). (see quotation).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.