American Heritage® Dictionary of the English Language, Fourth Edition
- n. Any of various oxides of iron, such as ferric oxide or ferrous oxide.
- n. chemistry The compound obtained by the reaction of oxygen on iron. Either iron(II) oxide (old term ferrous oxide, chemical formula FeO) or iron(III) oxide (old term ferric oxide, chemical formula Fe2O3). Generally known as rust when hydrated.
GNU Webster's 1913
- n. (Chem.) Any of the oxides of iron, especially ferric oxide.
“Synthetic colors, such as FD&C colors stick with iron oxide mineral pigments”
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