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.
Because of the absence of liquid water on Mars’s surface today, those rusty red minerals were thought to arise from dry iron oxides present in the dust, such as hematite. Doyle Rice, USA TODAY, 26 Feb. 2025 The scientists decided that the planet’s red color more closely matches that of iron oxides containing water, called ferrihydrite. Paul Smaglik, Discover Magazine, 25 Feb. 2025 The scientists created their own Martian dust in a laboratory using different types of iron oxide. Ashley Strickland, CNN, 25 Feb. 2025 The mesh coating relies on iron oxide and Nafion, which is a fluoropolymer-copolymer material that is often used in fuel cells. IEEE Spectrum, 15 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 12 Mar. 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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