: 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
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Exposure to silica dust can cause severe lung disease.
—
Rachel Frazin, The Hill, 1 Apr. 2025
Substances such as silica, gypsum, perchlorates and nanophase iron oxides contained in Martian dust could have life-threatening effects on members of a potential Mars mission, according to a study published in the journal GeoHealth last month.
—Jack Guy, CNN Money, 26 Mar. 2025
By using natural ingredients like bamboo that are rich in silica, the products increase volume, promote hair growth, and retain color and moisture in the hair, all while advancing sustainability.
—Molly Peck, USA TODAY, 3 Feb. 2025
Key ingredients: Vitamin E, silica | Size: 0.25 oz., 0.75 oz., 1.5 oz.
—Brigitt Earley, Glamour, 27 Feb. 2025
See All Example Sentences for silica
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Rachel Frazin, The Hill, 1 Apr. 2025
Substances such as silica, gypsum, perchlorates and nanophase iron oxides contained in Martian dust could have life-threatening effects on members of a potential Mars mission, according to a study published in the journal GeoHealth last month.
—Jack Guy, CNN Money, 26 Mar. 2025
By using natural ingredients like bamboo that are rich in silica, the products increase volume, promote hair growth, and retain color and moisture in the hair, all while advancing sustainability.
—Molly Peck, USA TODAY, 3 Feb. 2025
Key ingredients: Vitamin E, silica | Size: 0.25 oz., 0.75 oz., 1.5 oz.
—Brigitt Earley, Glamour, 27 Feb. 2025
See All Example Sentences for silica
Cite this Entry
“Silica.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/silica. Accessed 11 Apr. 2025.
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silica
noun
sil·i·ca
ˈsil-i-kə 
: a compound that consists of the dioxide of silicon and occurs in various forms (as in quartz, opal, and sand)
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