silica

noun

sil·i·ca | \ ˈsi-li-kə

Definition of silica

: the dioxide of silicon SiO₂ occurring in crystalline, amorphous, and impure forms (as in quartz, opal, and sand respectively)

Examples of silica in a Sentence

Recent Examples on the Web

Common ingredients include stain removers (such as sodium tripolyphosphateor hexametaphosphate and hydrated silica) and bleach, often listed as calcium peroxide or hydrogen peroxide. — Joanne Chen, Redbook, "Teeth: An Owner's Manual," 24 July 2017 According to the listing, the ingredients include a propellant, alcohol, iron oxides, talc, and fumed silica. — Cheryl Wischhover, Vox, "How spray-on hair does (and doesn’t) work," 17 Dec. 2018 Polly Trottenberg, the city’s transportation commissioner and an MTA board member appointed by Mayor Bill de Blasio, raised concerns Tuesday about the silica dust that could accumulate during the demolition of concrete in the tunnel. — Paul Berger, WSJ, "MTA Board Members Grill Consultants About Revised L Train Plan," 15 Jan. 2019 The silica and hydrogen peroxide in it strengthen nails, brighten hair and clear up acne and inflammation. — Alexandra Tunell, Harper's BAZAAR, "The Biggest Korean Beauty Trends to Know for 2016," 15 Jan. 2016 With tons of basalt rock around, the chemistry of the water would have reflected that rock—high in iron, magnesium, and silica. — Scott K. Johnson, Ars Technica, "The secret to Mars’ past warmth could be beneath Curiosity’s wheels," 9 Aug. 2018 Breathing in tiny silica particles has been linked to lung cancer, liver disease and an incurable swelling of the lungs. — Garance Burke, The Seattle Times, "Tenants allege Kushner firm pushed them out of their homes," 17 July 2018 And the chemical signatures in those glass pieces matched silica from the region around Samarra. — Kiona N. Smith, Ars Technica, "Medieval artisans built a glass-walled palace in the desert," 31 Aug. 2018 Dust samples taken from nine apartments in May by consultants Olmsted Environmental Services turned up dangerously high levels of lead and crystalline silica. — Garance Burke, The Seattle Times, "Tenants allege Kushner firm pushed them out of their homes," 17 July 2018

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

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Last Updated

8 May 2019

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Time Traveler for silica

The first known use of silica was circa 1801

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More Definitions for silica

silica

noun

English Language Learners Definition of silica

: a chemical that contains silicon, that is found in sand and quartz, and that is used to make glass

See the full definition for silica in the English Language Learners Dictionary

silica

noun

sil·i·ca | \ ˈsil-i-kə

Medical Definition of silica

: the dioxide of silicon SiO₂ that is used as an ingredient of simethicone and that occurs naturally in crystalline, amorphous, and impure forms (as in quartz, opal, and sand respectively)

— called also silicon dioxide