zinc oxide

noun

: an infusible white solid ZnO used especially as a pigment, in compounding rubber, and in pharmaceutical and cosmetic preparations (such as ointments and sunblocks)

Examples of zinc oxide in a Sentence

Recent Examples on the Web
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As the particles were cooled, the free zinc bound with oxygen to form zinc oxide crystals. New Atlas, 14 Feb. 2026 Overcoming these issues requires additional layers between copper and silicon, such as nickel, titanium, or zinc oxide, to block diffusion and enable proper electrical contact. Ni Tao, Interesting Engineering, 19 Jan. 2026 Only those with zinc oxide and titanium dioxide are allowed to be sold and used. Kathleen Wong, USA Today, 12 Dec. 2025 Mineral sunscreens, such as zinc oxide and titanium dioxide, form a protective barrier between the skin and the sun. Deidre McPhillips, CNN Money, 11 Dec. 2025 See All Example Sentences for zinc oxide

Word History

First Known Use

1849, in the meaning defined above

Time Traveler
The first known use of zinc oxide was in 1849

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Cite this Entry

“Zinc oxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/zinc%20oxide. Accessed 15 Feb. 2026.

Kids Definition

zinc oxide

noun
: a white substance that is used as a white pigment, is added to rubber, and is used in medical and cosmetic preparations (as ointments and sunblocks)

Medical Definition

zinc oxide

noun
: a white solid ZnO used in pharmaceutical and cosmetic preparations (as ointments and powders)

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