nal·trex·one (n l-tr k s n)n. A drug, C20H23NO4, used as an antagonist to narcotic drugs. [Blend of nal(o)xone and tre- (probably alteration of tri-, after the three carbon atoms in the propyl group that distinguishes it from naloxone, of which it is a congener).] |
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| Noun | 1. | naltrexone - an oral antagonist against the action of opiates narcotic antagonist - an antagonist used to counteract the effects of narcotics (especially to counteract the depression of respiration) |
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