stupefacient

[ stoo-puh-fey-shuhnt, styoo- ]
/ ˌstu pəˈfeɪ ʃənt, ˌstyu- /

adjective

stupefying; producing stupor.

noun

a drug or agent that produces stupor.

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Origin of stupefacient

1660–70; from Latin stupefacient- (stem of stupefaciēns ), present participle of stupefacere “to benumb”; see stupefy, -facient
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for stupefacient

stupefacient
/ (ˌstjuːpɪˈfeɪʃɪənt) /

noun

a drug that causes stupor

adjective

of, relating to, or designating this type of drug

Word Origin for stupefacient

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012