ferrous oxide

== English == === Etymology === ferrous + oxide === Noun === ferrous oxide (uncountable) (chemistry) The chemical compound FeO, iron oxide where iron has a valence of +2. Synonym: iron(II) oxide Hypernyms: oxide < compound, material Coordinate terms: ferric oxide, iron(III) oxide ==== Usage notes ==== IUPAC has deprecated this term in favor of iron(II) oxide. ==== Translations ====