Stu`pe*fa"cient (?), a. [L. stupefaciens, p.pr. of stupefacere to stupefy; stupere to be stupefied + facere to make. Cf. Stupefy.] [Written also stupifacient.]
Producing stupefaction; stupefactive.
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n. Med.
Anything promoting stupefaction; a narcotic.
© Webster 1913.