/ Dictionary / Index U UUM: Meaning and Definition of Find definitions for: UUM Pronunciation: [key] underwater-to-underwater missile. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. U.T.W.A. UV Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language