# ferrous oxide

> English word · Noun

## Definitions
1. The chemical compound FeO, iron oxide where iron has a valence of +2.

## Etymology
ferrous + oxide

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/ferrous-oxide