/ Dictionary / Index F ferruginous: Meaning and Definition of Find definitions for: fer•ru•gi•nous Pronunciation: (fu-r'ju-nus), [key] — adj. iron-bearing: ferruginous clays. of the color of iron rust. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ferrozirconium ferrule Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language