/ Dictionary / Index R rapido: Meaning and Definition of Find definitions for: ra•pi•do Pronunciation: (rä'pē-dō" Sp. rä'pē-&thslashô"It.rä'pē-dô), [key] — pl. -dos -di an express train. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rapidly advancing juvenile periodontitis rapid transit 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