/ Dictionary / Index E erythropsin: Meaning and Definition of Find definitions for: er•y•throp•sin Pronunciation: (er"u-throp'sin), [key] — n. Biochem. rhodopsin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. erythropoietin Erz Mountains Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language