[ pot-suh-lah-nuh; Italian pawt-tsaw-lah-nah ]
/ ˌpɒt səˈlɑ nə; Italian ˌpɔt tsɔˈlɑ nɑ /
a porous variety of volcanic tuff or ash used in making hydraulic cement.
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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for pozzolana
Not only the walls but the vaults were built in this pozzolana concrete, and formed one solid mass.
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