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.
The scientists proceeded to mix ferric nitrate with potassium hydroxide, creating a hard iron oxide mineral called nanocrystalline ferrihydrite, which occurs naturally in soil and water. Ben Coxworth, New Atlas, 29 Apr. 2025 For decades, spacecraft and rovers have gathered data pointing to a familiar explanation behind Mars' redness: the rusting of iron minerals, namely iron oxide, in the planet's dust. Victoria Corless, Space.com, 25 Feb. 2025 The samples are mostly water-rich clay, with sulfide, carbonate, and iron oxide minerals. Ars Technica, 30 Jan. 2025 The samples are mostly water-rich clay, with sulfide, carbonate and iron oxide minerals. Sara Russell, The Conversation, 29 Jan. 2025 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 13 Jun. 2025.

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

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