{ Poz′zu‐o‐la″na (?), Poz′zo‐la″‐na (?) }, n. Volcanic ashes from Pozzuoli, in Italy, used in the manufacture of a kind of mortar which hardens under water.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.