WordReference Random House Unabridged Dictionary of American English © 2025
titanium dioxide, [Chem.]
    a white, water-insoluble powder, TiO2, used chiefly in white pigments, plastics, ceramics, and for delustering synthetic fibers. Also called titanium oxide, ti•tanic oxide  (tī tanik, ti-).USA pronunciation 
    • 1920–25

Collins Concise English Dictionary © HarperCollins Publishers::
titanium dioxide
  1. a white insoluble powder occurring naturally as rutile and used chiefly as a pigment of high covering power and durability. Formula: TiO2
    Also called: titanium oxide, titanic oxide, titania
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