Breadcrumb Home > Dictionary > Index A arroyo: Meaning and Definition of Find definitions for: ar•roy•o Pronunciation: (u-roi'ō), [key] — pl. -os. (chiefly in southwest U.S.) a small steep-sided watercourse or gulch with a nearly flat floor: usually dry except after heavy rains. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arroyo (Thesaurus) arrowy Arroyo Grande TrendingHere are the facts and trivia that people are buzzing about. Did Birds Evolve from Dinosaurs? The Twelve Dancing Princesses Current Events This Week: January 2023 African Americans by the Numbers Andersen's Fairy Tales: Contents The Celtic Twilight: A Teller of Tales ✖ Related Content Daily Word Quiz: saturnine Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language