/ Dictionary / Index R roof rat: Meaning and Definition of Find definitions for: roof' rat" Pronunciation: [key] a black rat, Rattus rattus alexandrinus, often found on the upper floors of buildings in warm areas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. roof prism rooftop Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language