/ Dictionary / Index I iron pyrites: Meaning and Definition of Find definitions for: i'ron pyri'tes Pronunciation: [key] pyrite; fool's gold. marcasite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. iron putty iron rust Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language