Naltrexone

//nælˈtɹɛk.səʊn// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 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
  2. 2
    an oral antagonist against the action of opiates wordnet

Etymology

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

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.