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Meaning of stupefacient

stu•pe•fa•cient

Pronunciation: (st"pu-fā'shunt, sty"-), [key]
— adj.
  1. stupefying; producing stupor.
—n.
  1. a drug or agent that produces stupor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.