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noun
The base chemical structure of a large class of psychoactive drugs, consisting of opioid analgesics, antitussives, and dissociative hallucinogens, among others.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Topics: chemistry, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From morphine + -an.
