/ Dictionary / Index Y yttrotantalite: Meaning and Definition of Find definitions for: yt•tro•tan•ta•lite Pronunciation: (i"trō-tan'tl-īt"), [key] — n. a mineral, tantalite and niobate of yttrium and various elements, as iron, and cerium, occurring in the form of brown-black crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. yttrium metal Yü Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language