pozzuolana

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.

pozzuolana

(ˌpɒtswəˈlɑːnə) or

pozzolana

n

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]