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

For those dealing with hyperpigmentation, consider tinted sunscreens that contain iron oxides, which help protect against visible light in addition to UV rays. — Catharine Malzahn, Allure, 13 July 2026

For anyone worried about dark spots, iron oxides are the ingredient to watch. — Lauren Jarvis-Gibson july 1, Charlotte Observer, 1 July 2026

Meanwhile, iron oxides provide additional protection against visible light that can worsen hyperpigmentation. — Jenny Berg, Glamour, 22 June 2026

The acid in vinegar reacts with iron oxide and dissolves the rust. — Brandee Gruener, Southern Living, 22 June 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