naltrexone

== English == === Etymology === Probably from naloxone +‎ Latin tres (“three”). === Pronunciation === (Received Pronunciation) IPA(key): /nælˈtɹɛk.səʊn/ (General American) IPA(key): /nælˈtɹɛkˌsoʊn/ === Noun === naltrexone (uncountable) (pharmacology) A synthetic drug, similar to morphine, which blocks opiate receptors in the nervous system and is used chiefly in the treatment of heroin addiction. ==== Derived terms ==== === References === “naltrexone”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022. “naltrexone”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.