/ Dictionary / Index I infectious mononucleosis: Meaning and Definition of Find definitions for: infec'tious mononucleo'sis Pronunciation: [key] — Pathol. Pathol. an acute, infectious form of mononucleosis associated with Epstein-Barr virus, characterized by sudden fever and a benign swelling of lymph nodes. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. infectious laryngotracheitis infective Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language