Crossword clue: volcanic ashes from pozzuoli, in italy, used in the manufacture of a kind of mortar which hardens under water.

The most common answer is pozzolana (9 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

pozzolana 9 letters web-def

Volcanic ashes from Pozzuoli, in Italy, used in the manufacture of a kind of mortar which hardens under water.

pozzuolana 10 letters web-def

Volcanic ashes from Pozzuoli, in Italy, used in the manufacture of a kind of mortar which hardens under water.