/ Dictionary / Index I iron sponge: Meaning and Definition of Find definitions for: i'ron sponge' Pronunciation: [key] — Metall. Metall. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. iron sodium oxalate ironstone Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language