Webster’s Revised Unabridged Dictionary · 1913
Polverine
Pol′ve·rine (pŏl′vē·rĭn), n. [It. polverino, fr. polvere dust, L. pulvis, -veris. See Powder.] Glassmaker's ashes; a kind of potash or pearlash, brought from the Levant and Syria, — used in the manufacture of fine glass.