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
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The sand here was created by the erosion of nearby Navajo sandstone, and the rock gets its reddish-orange color from the iron oxide mineral hematite. Lydia Mansel, Travel + Leisure, 2 Apr. 2026 Key Ingredients: Titanium dioxide, iron oxides, tocopherol Finish: Dewy Type: Viscose liquid Shades: 15 Size: 0.31 fl. Conçetta Ciarlo, Vogue, 17 Mar. 2026 Scientists have built a new a lithium-ion (Li-ion) battery anode that incorporates iron oxide, the main component of rust, into microscopic, porous hollow carbon structures, and can improve battery performance. Georgina Jedikovska, Interesting Engineering, 5 Feb. 2026 Rust stains can be a challenge to remove from clothing, especially since iron oxide doesn't dissolve in water. Brandee Gruener, Southern Living, 31 Jan. 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 11 Apr. 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

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