/ Dictionary / Index M microsleep: Meaning and Definition of Find definitions for: mi•cro•sleep Pronunciation: (mī'krō-slēp"), [key] — n. Psychol. a moment of sleep followed by disorientation, experienced esp. by persons suffering from narcolepsy or sleep deprivation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microseism microsociology Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language