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Meaning of pozzolana

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.