/ Dictionary / Index G gamma iron: Meaning and Definition of Find definitions for: gam'ma i"ron Pronunciation: [key] an allotrope of iron, stable between 910°C and 1400°C and having a face-centered cubic lattice. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gammagram gamma ray Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language