pozzolana

[pot-suh-lah-nuh; Italian pawt-tsaw-lah-nah]

noun

a porous variety of volcanic tuff or ash used in making hydraulic cement.

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Also poz·zo·lan

[pot-suh-luh n] /ˈpɒt sə lən/, poz·zuo·la·na

[pot-swuh-lah-nuh; Italian pawt-tswaw-lah-nah] /ˌpɒt swəˈlɑ nə; Italian ˌpɔt tswɔˈlɑ nɑ/, puzzolan, puzzolana.

Origin of pozzolana

1905–10; < Italian < Latin puteolāna, feminine of puteolānus of Pozzuoli (< Latin Puteolī literally, little springs); see -an

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for pozzolana

Historical Examples

Not only the walls but the vaults were built in this pozzolana concrete, and formed one solid mass.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4
Various
This shows the utter unfitness of the pozzolana beds in which the arenaria are excavated for the construction of the Catacombs.
The Catacombs of Rome
William Henry Withrow