/ Dictionary / Index Y yttriferous: Meaning and Definition of Find definitions for: yt•trif•er•ous Pronunciation: (i-trif'ur-us), [key] — adj. yielding or containing yttrium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. yttria yttrium Related Content Daily Word Quiz: braggart Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language