pozzolana: Meaning and Definition of

poz•zo•la•na

Pronunciation: (pot"su-lä'nuIt.pôt"tsô-lä'nä), [key]
— n.
  1. a porous variety of volcanic tuff or ash used in making hydraulic cement.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.