poz·zo·lan

(pŏt′sə-län′) also poz·zo·la·na (-sə-lä′nə) or poz·zuo·la·na (-swə-)

1. A siliceous volcanic ash used to produce hydraulic cement.

2. Any of various powdered substances that react with lime to form strengthening or enhancing compounds in cement.

[Italian pozzolana, after Pozzuoli.]

poz′zo·la′nic adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pozzuolana

(ˌpɒtswəˈlɑːnə) or

pozzolana

1. (Geological Science) a type of porous volcanic ash used in making hydraulic cements

2. (Building) any of various artificial substitutes for this ash used in cements

German name: puzzolana

[C18: from Italian: of Pozzuoli]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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