Fer-rēt'to, n.
n. [It. ferretto di Spagna, diminutive of ferro, equivalent to Lat. ferrum, iron.] Copper calcined with brimstone or white vitriol, used to color glass. Hebert.
n. [It. ferretto di Spagna, diminutive of ferro, equivalent to Lat. ferrum, iron.] Copper calcined with brimstone or white vitriol, used to color glass. Hebert.