titanium dioxide

/T AY0 T EY1 N IY0 AH0 M D AY0 AA1 K S AY0 D/
noun
  1. 1

    A brilliant white powder, TiO2, used as a pigment, and in sunblock, toothpaste and cosmetics

Source: https://en.wiktionary.org/wiki/titanium%20dioxide