poz·zo·lan 
(pŏt′sə-län) also poz·zo·la·na (-sə-länə) or poz·zuo·la·na (-swə-)
(pŏt′sə-län) also poz·zo·la·na (-sə-länə) 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·lanic adj.
- high beam
- highbinder
- high blood pressure
- highborn
- highboy
- highbred
- highbrow
- highbrowism
- highbush blueberry
- highbush cranberry
- highchair
- High-Church
- high-class
- high comedy
- high command
- high commissioner
- high-concept
- high-count
- high court
- high-def
- high definition
- high-definition
- high-density lipoprotein
- high-density polyethylene
- high-end