Your favorite word could be our Word of the Day!


[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. 2014.
Cite This Source
Examples from the web for pozzolana
  • Artificial pozzolana are materials such as blast- furnace slag, ground brick, and some fly ashes from powdered coal furnaces.
British Dictionary definitions for pozzolana


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
Word Origin
C18: from Italian: of Pozzuoli
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Encyclopedia Article for pozzolana


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

Learn more about pozzolan with a free trial on
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Difficulty index for pozzolana

Few English speakers likely know this word

Word Value for pozzolana

Scrabble Words With Friends

Nearby words for pozzolana