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naltrexone.

A synthetic drug, similar to morphine, which blocks opiate receptors in the nervous system and is used chiefly in the treatment of heroin addiction.

10 characters3 syllables approx.English language

Meaning & usage

noun/nælˈtɹɛk.səʊn/Received-Pronunciation/nælˈtɹɛkˌsoʊn/General-American
  1. A synthetic drug, similar to morphine, which blocks opiate receptors in the nervous system and is used chiefly in the treatment of heroin addiction.

    uncountable
Where this word comes from

Probably from naloxone + Latin tres (“three”).

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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.