/ Dictionary / Index E estrin: Meaning and Definition of Find definitions for: es•trin Pronunciation: (es'trin), [key] — n. Biochem., Pharm. estrone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. estrildid estriol Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language