iron oxide

noun

: any of several oxides of iron: such as
b
: the monoxide FeO of iron

Examples of iron oxide in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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 To address the problem, the researchers engineered a heterointerface combining iron oxide (Fe2O3) and samarium oxide (Sm2O3). Neetika Walter, Interesting Engineering, 13 June 2026 See All Example Sentences for iron oxide

Word History

First Known Use

1790, in the meaning defined above

Time Traveler
The first known use of iron oxide was in 1790

Cite this Entry

“Iron oxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/iron%20oxide. Accessed 5 Jul. 2026.

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

More from Merriam-Webster on iron oxide

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster