[stoo-puh-fey-shuh nt, styoo-]
See more synonyms for stupefacient on
  1. a drug or agent that produces stupor.

Origin of stupefacient

1660–70; < Latin stupefacient- (stem of stupefaciēns) present participle of stupefacere to benumb; see stupefy, -facient Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for stupefacient


  1. a drug that causes stupor
  1. 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