titanium dioxide

noun

: an oxide TiO2 of titanium that occurs in rutile, anatase, and ilmenite and is used especially as a pigment

Examples of titanium dioxide in a Sentence

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Look for ingredients like zinc oxide or titanium dioxide in your sunscreen, which keep both UVB and the more dangerous UVA rays at bay. — Norah O'Donnell, CBS News, 21 Oct. 2026 These nanoscale components are usually made from rigid silicon and transition metal oxides, such as hafnium oxide (HfOx) or titanium dioxide (TiO2), and layered alongside dense, heavy metals like platinum or tungsten. — New Atlas, 18 Oct. 2026 Rio Tinto in Canada extracts high-purity scandium oxide from titanium dioxide waste streams produced from its Lac Tio mine operations in Quebec. — Maria Mocerino, Interesting Engineering, 3 Oct. 2026 Reef-safe, mineral formulas with zinc oxide or titanium dioxide are a better solution. — Leslie Baumann, Miami Herald, 17 Sep. 2026 See All Example Sentences for titanium dioxide

Word History

First Known Use

1877, in the meaning defined above

Time Traveler
The first known use of titanium dioxide was in 1877

Rhymes for titanium dioxide

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Browse Nearby Words

titanium carbide
titanium dioxide
titanium oxide
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Cite this Entry

“Titanium dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/titanium%20dioxide. Accessed 27 Oct. 2026.

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Medical Definition

titanium dioxide

noun
: an oxide TiO2 of titanium that is used especially as a pigment and in sunblocks

More from Merriam-Webster on titanium dioxide

Britannica.com: Encyclopedia article about titanium dioxide

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