/ Dictionary / Index M Montes Riphaeus: Meaning and Definition of Find definitions for: Mon•tes Riph•ae•us Pronunciation: (mon'tēz rif'ē-us), [key] a mountain range in the third quadrant of the visible face of the moon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Montesquieu Montessori Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language