Pozzolana

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Pozzuolana \Poz`zu*o*la"na\, Pozzolana \Poz`zo*la"*na\, n. [It.]
     Volcanic ashes from Pozzuoli, in Italy, used in the
     manufacture of a kind of mortar which hardens under water.
     [1913 Webster]