/ Dictionary / Index Q quinestrol: Meaning and Definition of Find definitions for: quin•es•trol Pronunciation: (kwin-es'trôl, -trol), [key] — n. Pharm. a synthetic estrogen, CHO, used in oral contraceptives. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quinella Qui Nhon Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language