/ Dictionary / Index G gray iron: Meaning and Definition of Find definitions for: gray' i"ron Pronunciation: [key] pig iron or cast iron having much of its carbon in the form of graphite and exhibiting a gray fracture. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. grayhound grayish Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language