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Meaning of somnifacient

som•ni•fa•cient

Pronunciation: (som"nu-fā'shunt), [key]
— adj.
  1. causing or inducing sleep.
—n.
  1. a drug or other agent that induces or tends to induce sleep.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.