/ Dictionary / Index R RATO: Meaning and Definition of Find definitions for: RATO Pronunciation: (rā'tō), [key] — n. Rocketry. rocket-assisted takeoff. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ratline ratoon Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language