siliceous

adjective

si·​li·​ceous sə-ˈli-shəs How to pronounce siliceous (audio)
variants or less commonly silicious
: of, relating to, or containing silica or a silicate
siliceous limestone

Examples of siliceous in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This disk can be quite thick and choked with dust—small grains of matter made up of siliceous (rocky) or carbonaceous (sootlike) material. Phil Plait, Scientific American, 13 Feb. 2025 Granite is a siliceous stone composed primarily of silicates, such as quartz, feldspar, and mica. Caitlin Sole, Better Homes & Gardens, 4 Aug. 2022 Whereas 95% of Cognac is produced from the Ugni Blanc grape that thrives above limestone soils, grapes for Armagnac include Ugni Blanc, Folle Blanche, Baco and Colombard, which sprout over quartz sand and siliceous clay soils. Tom Mullen, Forbes, 13 Mar. 2022 This giant phosphorescent abstract layered atoll of cascading siliceous marks of what looks like finger paintings made in a cave or a prisoner making counting strokes and notations on a wall. Jerry Saltz, Vulture, 22 Sep. 2021 Siliceous stones include granite, slate, quartzite, soapstone, and sandstone. Seal Team One, The Seattle Times, 15 May 2017

Word History

Etymology

Latin siliceus of flint, from silic-, silex hard stone, flint

First Known Use

circa 1656, in the meaning defined above

Time Traveler
The first known use of siliceous was circa 1656

Browse Nearby Words

Cite this Entry

“Siliceous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/siliceous. Accessed 5 Jul. 2026.

Medical Definition

siliceous

adjective
si·​li·​ceous
variants also silicious
: of, relating to, or containing silica or a silicate
a siliceous cement used in dentistry
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