/ Dictionary / Index R rapid eye movement sleep: Meaning and Definition of Find definitions for: rap'id eye' move"ment sleep". Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rapid eye movement rapid fire Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language