/ Dictionary / Index F ferredoxin: Meaning and Definition of Find definitions for: fer•re•dox•in Pronunciation: (fer"u-dok'sin), [key] — n. Biochem. any of a group of red-brown proteins containing iron and sulfur and acting as an electron carrier during photosynthesis, nitrogen fixation, or oxidation-reduction reactions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ferrate Ferrel's law Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language