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stupefacient

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

adjective

  1. stupefying; producing stupor.

noun

  1. a drug or agent that produces stupor.

stupefacient British  
/ ˌstjuːpɪˈfeɪʃɪənt /

noun

  1. a drug that causes stupor

"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

adjective

  1. of, relating to, or designating this type of drug

"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

Etymology

Origin of stupefacient

1660–70; from Latin stupefacient- (stem of stupefaciēns ), present participle of stupefacere “to benumb”; stupefy, -facient ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.