si·​li·​ceous | \ sə-ˈli-shəs How to pronounce siliceous (audio) \
variants: or less commonly silicious

Definition of siliceous

: of, relating to, or containing silica or a silicate siliceous limestone

Examples of siliceous in a Sentence

Recent Examples on the Web 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

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

First Known Use of siliceous

circa 1656, in the meaning defined above

History and Etymology for siliceous

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

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Time Traveler for siliceous

Time Traveler

The first known use of siliceous was circa 1656

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Dictionary Entries Near siliceous



siliceous sinter

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Statistics for siliceous

Last Updated

6 Oct 2021

Cite this Entry

“Siliceous.” Dictionary, Merriam-Webster, Accessed 25 Oct. 2021.

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More Definitions for siliceous


variants: also silicious \ sə-​ˈlish-​əs How to pronounce siliceous (audio) \

Medical Definition of siliceous

: of, relating to, or containing silica or a silicate a siliceous cement used in dentistry


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