/ Dictionary / Index Y yttria: Meaning and Definition of Find definitions for: yt•tri•a Pronunciation: (i'trē-u), [key] — n. Chem. a white, water-insoluble powder, YO, used chiefly in incandescent gas and acetylene mantles. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ytterbium yttriferous Related Content Daily Word Quiz: irreparable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language