/ Dictionary / Index U Umbriel: Meaning and Definition of Find definitions for: Um•bri•el Pronunciation: (um'brē-el"), [key] — n. Astron. a moon of the planet Uranus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Umbrian umbriferous Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language