/ Dictionary / Index S slow-wave sleep: Meaning and Definition of Find definitions for: slow'-wave' sleep" Pronunciation: (slō'wāv'), [key] — Physiol. Physiol. a recurrent period of deep sleep, typically totaling five or six hours a night, distinguished by the presence of slow brain waves and by very little dreaming. Also calledCf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. slow wave slow-witted Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language