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[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, pozzolan
[pot-suh-luh n] /ˈpɒt sə lən/ (Show IPA),
[pot-swuh-lah-nuh; Italian pawt-tswaw-lah-nah] /ˌpɒt swəˈlɑ nə; Italian ˌpɔt tswɔˈlɑ nɑ/ (Show IPA),
puzzolan, puzzolana.
1905-10; < Italian < Latin puteolāna, feminine of puteolānus of Pozzuoli (< Latin Puteolī literally, little springs); see -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pozzolan
  • They are similar to pozzolan lime cements in their properties.
Encyclopedia Article for pozzolan

hydraulic cement discovered by the Romans and still used in some countries, made by grinding pozzolana (a type of slag that may be either natural-i.e., volcanic-or artificial, from a blast furnace) with powdered hydrated lime. Roman engineers used two parts by weight of pozzolana mixed with one part of lime to give strength to mortar and concrete in bridges and other masonry and brickwork. During the 3rd century BC, the Romans used pozzolana instead of sand in concrete and mortared rubblework, giving extraordinary strength. Used with an aggregate of broken tuff, travertine, brick, or marble, the material contributed to the evolution of new architectural forms in such monumental constructions as the Pantheon and the Baths of Caracalla at Rome

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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