pozzolana

[ 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.

Origin of pozzolana

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

An artificial product which serves perfectly as a pozzuolana is granulated blast-furnace slag.

Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 |Various
In 1775 he discovered in the Velay a rich deposit of pozzuolana, which in due course was worked by the government.

Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 |Various

pozzuolana

/ (ˌpɒtswəˈlɑːnə) /

a type of porous volcanic ash used in making hydraulic cements

any of various artificial substitutes for this ash used in cements

German name: puzzolana

C18: from Italian: of Pozzuoli