/ Dictionary / Index D delta iron: Meaning and Definition of Find definitions for: del'ta i"ron Pronunciation: [key] — Metall. Metall. an allotrope of iron, stable above 1400°C, having a body-centered cubic lattice structure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. deltaic delta particle Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language