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

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What to look for: No nanoparticles Free from chemicals like oxybenzone, butylparaben, octinoxate, octocrylene, and PABA Non-nano zinc oxide or non-nano titanium dioxide for UVA/UVB (broad spectrum) coverage Lotion or balm, not spray. Mandy Ferreira, Sunset, "10 Sunscreens That Keep You and the Coral Reefs Safe," 22 Jan. 2018 Mineral sunscreens—physical blockers with ingredients like zinc and titanium dioxide—should be applied at the end of your regimen, says Dr. Shah. Talia Abbas, SELF, "I Had a Dermatologist Critique My Skin-Care Routine—and Here's What I'm Changing," 20 June 2018 Prices for titanium dioxide—the company’s largest product line—stabilized just as Opteon took off, giving Chemours some needed momentum. Ken Otterbourg, Fortune, "Teflon’s River of Fear," 24 May 2018 Try to choose a physical sunscreen that contains zinc oxide and/or titanium dioxide, rather than chemical ingredients like oxybenzone and octyl methoxycinnamate. Dr. Leslie Baumann, miamiherald, "What are the best sunscreens for swimming and sports? | Miami Herald," 22 May 2018 Among the chemical sunscreen ingredients that wouldn't be affected by the ban are avobenzone, octisalate, octocrylene, and homosalate; there are also plenty of mineral sunscreen options that rely on zinc oxide and/or titanium dioxide. Marci Robin, Teen Vogue, "Hawaii State Legislature Passes Chemical Sunscreen Ingredients Bill," 3 May 2018 The non-profit Environmental Working Group, which ranks sunscreen brands based on effectiveness and chemical composition, reports zinc oxide and titanium dioxide sunscreens are usually most environmentally friendly. Ashley May, USA TODAY, "Hawaii may ban sunscreen that kills coral reefs. What sunscreen is safe for the environment?," 2 May 2018 And neither titanium dioxide nor zinc oxide is fully sustainable, due to the compounds’ extraction and synthesis processes. Brigit Katz, Smithsonian, "Scientists Create a Super-White Coating, with Help from a Super-White Beetle," 15 Mar. 2018 The researchers coated conventional paper with nanoparticles of two chemicals: Prussian blue, the pigment that gives blueprints their characteristic color, and titanium dioxide, a substance used in sunscreens. Mark Peplow, Scientific American, "Reprintable Paper Offers Sustainable Alternative to the Printed Word," 1 June 2017

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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The first known use of titanium dioxide was in 1877

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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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to make faulty or ineffective

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