pozzolana

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

/ ˌpɒt səˈlɑ nə; Italian ˌpɔt tsɔˈlɑ nɑ /

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

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Also poz·zo·lan

[pot-suh-luhn], /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.

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

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
The celebrated Pozzolana sand makes the best mortar in the world, from its gritty nature.
Museum of Antiquity|L. W. Yaggy
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