Dictionarysop•o•rif•icPronunciation: (sop"u-rif'ik, sō"pu-), [key] —adj. 1. causing or tending to cause sleep. 2. pertaining to or characterized by sleep or sleepiness; sleepy; drowsy. —n. something that causes sleep, as a medicine or drug. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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