pozzolana
noun
poz·zo·la·na
ˌpät-sə-ˈlä-nə 
variants
or pozzolan
: finely divided siliceous or siliceous and aluminous material that reacts chemically with slaked lime at ordinary temperature and in the presence of moisture to form a strong slow-hardening cement
Examples of pozzolana in a Sentence
Recent Examples on the Web
Della Cultura This meant that during wall construction, the mixture of lime, pozzolana and stones was still hot due to a thermal reaction.
—
Reuters, NBC News, 25 Mar. 2024
Colored glass, marble and a special volcanic stone called pozzolana pull the artwork together.
—Christopher Parker, Smithsonian Magazine, 21 Dec. 2023
For instance, in the mortar used during the first phase of construction, pink pozzolana was used exclusively, while the mortar used in the second phase also contained volcanic glass—typical of a different deposit of pink pozzolana further afield.
—Jennifer Ouellette, Ars Technica, 17 Feb. 2022
The ancient Romans did something similar, using volcanic ash in their pozzolana concrete, examples of which have lasted thousands of years.
—IEEE Spectrum, 4 June 2018
Clay was a major component, and a volcanic ash, today called pozzolana, was also used.
—Jonathan Schifman, Popular Mechanics, 12 Oct. 2017
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Reuters, NBC News, 25 Mar. 2024
Colored glass, marble and a special volcanic stone called pozzolana pull the artwork together.
—Christopher Parker, Smithsonian Magazine, 21 Dec. 2023
For instance, in the mortar used during the first phase of construction, pink pozzolana was used exclusively, while the mortar used in the second phase also contained volcanic glass—typical of a different deposit of pink pozzolana further afield.
—Jennifer Ouellette, Ars Technica, 17 Feb. 2022
The ancient Romans did something similar, using volcanic ash in their pozzolana concrete, examples of which have lasted thousands of years.
—IEEE Spectrum, 4 June 2018
Clay was a major component, and a volcanic ash, today called pozzolana, was also used.
—Jonathan Schifman, Popular Mechanics, 12 Oct. 2017
Cite this Entry
“Pozzolana.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pozzolana. Accessed 3 Nov. 2025.
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