pozzolan

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poz·zo·lan

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