/ Dictionary / Index M mestranol: Meaning and Definition of Find definitions for: mes•tra•nol Pronunciation: (mes'tru-nôl", -nol"), [key] — n. Pharm. an estrogen, CHO, used in oral contraceptives in combination with a progestin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mestranol (Thesaurus) mestizo Meštrović Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language