Home › Words › F › ferrettoferrettoferretto means copper sulphide, used to colour glass.EtymologyFrom Italian ferretto di Spagna, diminutive of ferro (“iron”), from Latin ferrum.nouncopper sulphide, used to colour glass.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.feretto 78% match — A rich reddish-brown pigment obtained by calcining copper and sulfur together in closed crucibles. vs ferretto →colcothar 60% match — Polishing rouge; a reddish-brown oxide of iron, used in polishing glass, and also as a pigment. vs ferretto →alquifou 60% match — A lead ore found in Cornwall, England, and used to give a green glaze to pottery. vs ferretto →copperose 59% match — copperas vs ferretto →ferrorhodsite 58% match — An isometric-hexoctahedral black mineral containing copper, iridium, iron, platinum, rhodium, and sulfur. vs ferretto →copperas 58% match — Iron(II) sulfate. vs ferretto →ferruccite 58% match — An orthorhombic-dipyramidal mineral containing boron, fluorine, and sodium. vs ferretto →ferrisurite 57% match — A monoclinic mineral containing aluminum, carbon, copper, fluorine, hydrogen, iron, lead, oxygen, silicon, and sodium. vs ferretto →