/ Dictionary / Index E Epstein-Barr virus: Meaning and Definition of Find definitions for: Ep'stein-Barr' vi"rus Pronunciation: (ep'stīn bär'), [key] a type of herpes virus that causes infectious mononucleosis. Abbr.: EBV Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Epstein EPT 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