/ Dictionary / Index M Monmouth: Meaning and Definition of Find definitions for: Mon•mouth Pronunciation: (mon'muth), [key] — n. 1649–85, illegitimate son of Charles II of England and pretender to the throne of James II. a city in W Illinois. 10,706. Monmouthshire. former name of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monk's pepper tree Monmouthshire Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language