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pozzolana

[pot-suh-lah-nuh; Italian pawt-tsaw-lah-nah] /ˌpɒt səˈlɑ nə; Italian ˌpɔt tsɔˈlɑ nɑ/
noun
1.
a porous variety of volcanic tuff or ash used in making hydraulic cement.
Also, pozzolan
[pot-suh-luh n] /ˈpɒt sə lən/ (Show IPA),
pozzuolana
[pot-swuh-lah-nuh; Italian pawt-tswaw-lah-nah] /ˌpɒt swəˈlɑ nə; Italian ˌpɔt tswɔˈlɑ nɑ/ (Show IPA),
puzzolan, puzzolana.
Origin of pozzolana
1905-1910
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 Dictionary, © Random House, Inc. 2015.
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