titanium dioxide


Definition of titanium dioxide

: 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

Recent Examples on the Web

Decades ago, the sunscreens that Americans were dabbing on their noses were often mineral concoctions, like zinc oxide and titanium dioxide, that sat on the skin in a thick white cream and physically blocked the sun’s rays. Kim Tingley, New York Times, "When You Wear Sunscreen, You’re Taking Part in a Safety Study," 23 July 2019 Physical sunscreens contain mineral ingredients—like titanium dioxide or zinc oxide—and sit on top of the skin to deflect and distribute damaging UVA and UVB rays away from the skin. Susan Brickell, Health.com, "What Does SPF Stand For? We Asked Dermatologists," 21 June 2019 Travelers instead may use reef-safe sunscreens made with minerals such as zinc oxide and titanium dioxide (here’s a list of hundreds of coral-safe sunscreens to try). Los Angeles Times, "U.S. Virgin Islands’ ban on harmful sunscreens to go into effect Jan. 1," 28 Aug. 2019 The former uses zinc or titanium dioxide to physically scatter and deflect the DNA-damaging UV rays that can lead to premature skin aging and cancer. Jenna Rosenstein, Harper's BAZAAR, "Is Your Sunscreen Safe? The Case for Switching to a Mineral Sunscreen," 12 Aug. 2019 The company wants to mine titanium dioxide less than 4 miles (6.4 kilometers) from the Okefenokee National Wildlife Refuge. Washington Post, "Agency says mining near Okefenokee poses ‘substantial risks’," 19 July 2019 For a range of ultraviolet wavelengths, the lens — made of a stack of silver and titanium dioxide layers — has a refractive index of -1, roughly equal and opposite to that of air. Quanta Magazine, "Physicists Close In on ‘Perfect’ Optical Lens," 8 Aug. 2013 The full list of ingredients for the hair vitamins include: glucose syrup, sugar, water, pectin, citric acid, sodium citrate, natural flavors, titanium dioxide, Blue 1, coconut oil, and carnauba wax. Caroline Picard, Good Housekeeping, "Do SugarBearHair Vitamins Really Work? Here's What Our Nutritionist Says," 22 May 2019 Chalkboard paints typically contain talc, titanium dioxide, and silicon dioxide, making for a surface that will hold chalk. Hadley Keller, House Beautiful, "Everything You Need to Know About Chalkboard Paint," 29 Apr. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'titanium dioxide.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of titanium dioxide

1877, in the meaning defined above

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Last Updated

30 Sep 2019

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Time Traveler for titanium dioxide

The first known use of titanium dioxide was in 1877

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More Definitions for titanium dioxide

titanium dioxide


Medical Definition of titanium dioxide

: 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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