/pot'seuh lah"neuh/ ; It. /pawt'tsaw lah"nah/ , n.
a porous variety of volcanic tuff or ash used in making hydraulic cement.
Also, pozzolan /pot"seuh leuhn/ , pozzuolana /pot'sweuh lah"neuh/ ; It. /pawt'tswaw lah"nah/ , puzzolan, puzzolana .
[ 1905-10; puteolana, fem. of puteolanus of POZZUOLI ( Puteoli lit., little springs); see -AN ]