# ferretto

> English word · Noun

## Definitions
1. copper sulphide, used to colour glass.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/ferretto