/ Dictionary / Index E extrinsic factor: Meaning and Definition of Find definitions for: extrin'sic fac'tor Pronunciation: [key] — Biochem. Biochem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extrinsic eye muscle extro- Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language