P0495500 (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.
pozzolanic
(ˌpɒtsəˈlɑːnɪk) adj (Geological Science) consisting of, containing or of the nature of pozzolana