/ Dictionary / Index U universal donor: Meaning and Definition of Find definitions for: u'niver'sal do'nor Pronunciation: [key] a person with blood of group O. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. universal coupling universal gas constant Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language