from Latin mons (plural montes) "mountain" (from PIE root *men- (2) "to project"); used in English in various anatomical senses, especially mons Veneris "mountains of Love," fleshy eminence atop the vaginal opening, 1690s; often mons for short.
monotonous
monotony
monotype
monoxide
Monroe
mons
monseigneur
monsieur
monsignor
monsoon
monster