# naltrexone

> English word · Noun · IPA /nælˈtɹɛk.səʊn/ · frequency rank #81,618

## Definitions
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.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-02.
Canonical page: https://plainspell.com/en/word/naltrexone