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Inducing stupor; stupefying or narcotic.
A drug, such as a narcotic, that induces stupor.
[Latin stupefaciēns, stupefacient-, present participle of stupefacere, to stupefy; see stupefy.]
(Pharmacology) a drug that causes stupor
(Pharmacology) of, relating to, or designating this type of drug
[C17: from Latin stupefacere to make senseless, from stupēre to be stunned + facere to make]