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adverse event

From Wiktionary, the free dictionary

English

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Noun

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adverse event (plural adverse events)

  1. (medicine, pathology) Any occurrence that has any negative (deleterious) influence (in any degree from mild to severe).
    Hyponyms: adverse effect (loosely synonymous), side effect (loosely synonymous)
    adverse events in the treatment group
    adverse events in the control group

Usage notes

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