/ Dictionary / Index T titanium dioxide: Meaning and Definition of Find definitions for: tita'nium diox'ide Pronunciation: (tī-tan'ik, ti-). [key] — Chem. Chem. a white, water-insoluble powder, TiO, used chiefly in white pigments, plastics, ceramics, and for delustering synthetic fibers. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. titanium titanium white 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