One of the mysteries of the English language finally explained.
A synthetic opioid similar to morphine in chemical structure, which acts as a mixed opioid antagonist and agonist and formerly was used in the diagnosis and treatment of narcotic abuse and overdosage; (−)-(5R,6S)-9a-allyl-4,5-epoxymorphin-7-en-3,6-diol, C₁₉H₂₁NO₃. [A trademark for this drug in the United States is Nalline.]
1950s; earliest use found in Journal of Pharmacological and Experimental Therapeutics. Shortened from N-allylnormorphine, an alternative name for the compound.
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