iron oxide

noun

: any of several oxides of iron: such as

a

: ferric oxide

b

: the monoxide FeO of iron

Examples of iron oxide in a Sentence

Recent Examples on the Web

Durupınar is a natural geological formation composed of sedimentary material rich in iron oxides. — Eric Vanden Eykel, The Conversation, 6 Oct. 2026

Titanium dioxide and iron oxides supply the pigment—though the former doesn’t make this a substitute for sunscreen—and light-reflecting mica keeps the finish from looking flat. — Christa Joanna Lee, Allure, 6 Sep. 2026

The results suggest the bright red pigment came from a clay rich in tiny particles of iron oxide, or haematite. — Mike McRae 17, New Atlas, 17 Aug. 2026

Rust stains can be a challenge to remove from clothing, especially since iron oxide doesn’t dissolve in water. — Brandee Gruener, Southern Living, 17 Aug. 2026

Word History

First Known Use

1790, in the meaning defined above

Rhymes for iron oxide

• acetamide
• acetonide
• acidified
• antimonide
• beatified
• benzaldehyde
• borohydride
• chalcogenide
• commodified
• decalcified
• declassified
• disaccharide

Kids Definition

iron oxide

noun

: any of the oxides of iron

especially : ferric oxide

Medical Definition

iron oxide

noun

: any of several oxides of iron

especially : ferric oxide