Definition from Wiktionary, the free dictionary
pozzolan (plural pozzolans)
- Any material which, when combined with calcium hydroxide, exhibits cementitious properties; often used as an extender with Portland cements.
2009 March 31, Henry Fountain, “Concrete Is Remixed With Environment in Mind”, New York Times:
- Both are what are called pozzolans, reactive materials that help make the concrete stronger.