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

Andrade and her team synthesized and coated iron oxide magnetic nanoparticles with bioactive glass. —New Atlas, 3 Jan. 2026

The sand here was created by the erosion of nearby Navajo sandstone; the rock gets its reddish-orange color from the iron oxide mineral hematite. —Lydia Mansel, Travel + Leisure, 11 Dec. 2025

Discovery challenges decades-old assumption For decades, scientists believed the moon lacked the conditions needed for iron oxidation, making iron oxides virtually nonexistent on its surface. —Bojan Stojkovski, Interesting Engineering, 16 Nov. 2025

This mineral formula boasts a high sun protection factor of SPF 75 in a richer, tinted formula that contains iron oxides to protect against visible light, including blue light, says Dr. Reszko. —Emily Orofino, Vogue, 30 Oct. 2025

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