ferretto

From Italian ferretto di Spagna, diminutive of ferro (“iron”), from Latin ferrum.

ferretto (uncountable)

1. copper sulphide, used to colour glass.

• Luke Hebert (1849) The Engineer's & Mechanic's Encyclopeadia
• “ferretto”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

ferretto m (plural ferretti)

1. a piece of iron
2. underwire (of a bra)
3. red soil, rich in iron oxides

• fretterò