/ Dictionary / Index N nodular cast iron: Meaning and Definition of Find definitions for: nod'ular cast' i'ron Pronunciation: [key] any of various cast irons strengthened by having the graphite content in the form of nodules rather than flakes, and containing cerium or magnesium as well as other additives. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nodular nodule Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language