Breadcrumb Home > Dictionary > Index G Guido d'Arezzo: Meaning and Definition of Find definitions for: Gui•do d'A•rez•zo Pronunciation: (gwē'dô dä-ret'tsô), [key] — (Guido Aretinus) (“Fra Guittone”), c995–1049?, Italian monk and music theorist: reformer of musical notation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Guido guidon TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: loquacious Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language