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stupefacient

[stoo-puh-fey-shuh nt, styoo-] /ˌstu pəˈfeɪ ʃənt, ˌstyu-/
adjective
1.
stupefying; producing stupor.
noun
2.
a drug or agent that produces stupor.
Origin
1660-1670
1660-70; < Latin stupefacient- (stem of stupefaciēns) present participle of stupefacere to benumb; see stupefy, -facient
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for stupefacient

stupefacient

/ˌstjuːpɪˈfeɪʃɪənt/
noun
1.
a drug that causes stupor
adjective
2.
of, relating to, or designating this type of drug
Word Origin
C17: from Latin stupefacere to make senseless, from stupēre to be stunned + facere to make
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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