fer·​rous | \ ˈfer-əs How to pronounce ferrous (audio) , ˈfe-rəs \

Definition of ferrous

1 : of, relating to, or containing iron
2 : being or containing divalent iron

Examples of ferrous in a Sentence

Recent Examples on the Web Then, Caplan says, the last remnants—the long-simmering white dwarfs—will reignite like trick birthday cake candles as their centers are finally dense and ferrous enough to react. Caroline Delbert, Popular Mechanics, "Sad! This Is When the Universe Will Truly End," 24 Aug. 2020 This oxidized the iron present in the sand needed to produce glass, clearing up its blue-green tint by transforming ferrous to paler ferric. Alex Fox, Smithsonian Magazine, "Ancient Rome’s Finest Glass Was Actually Made in Egypt," 5 Aug. 2020 With impressive specificity, EBC Brakes says that 92 percent of the brake dust on a wheel is ferrous metal material. Car and Driver, "Explained: Car and Driver Will Now Take Your Questions," 10 Apr. 2020 Specifically, the four iron atoms in hemoglobin are oxidized from their normal ferrous state (Fe2+) to a ferric form (Fe3+), making methemoglobin, which is essentially useless as an oxygen carrier. Beth Mole, Ars Technica, "Blueish woman with chocolaty blood highlights rare risk of common anesthetic," 23 Sep. 2019 Even the most robust bike is going to show the effects of constant salt air bombardment, and the Coasts did reveal their few ferrous parts—the nut and bolt under the seat post, for instance. Ezra Dyer, Popular Mechanics, "Does a Rust-Proof Bike Really Exist?," 18 July 2019 Iron-ore futures reached fresh 4½-year highs on Friday, with ongoing tumult for miner Vale SA extending the ferrous metal’s sharp recent gains. David Hodari, WSJ, "Iron-Ore Rally Continues as Vale Ordered to Evacuate Town," 8 Feb. 2019 In a salty, ferrous glacial waterfall known as Blood Falls, her team previously discovered a new strain of bacteria adapted to survive in brutally cold temperatures. Daniela Hernandez, WSJ, "The Hunt for Alien Life Starts in Earth’s Most Extreme Places," 9 Apr. 2019 The next station uses a huge rotating magnet to pull out any ferrous metals, which range from tin cans (which have very little tin) to car parts. John Timmer, Ars Technica, "Bikes, bowling balls, and the delicate balancing act that is modern recycling," 31 Dec. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ferrous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ferrous

1755, in the meaning defined at sense 1

History and Etymology for ferrous

New Latin ferrosus, from Latin ferrum

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Time Traveler for ferrous

Time Traveler

The first known use of ferrous was in 1755

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Statistics for ferrous

Last Updated

7 Sep 2020

Cite this Entry

“Ferrous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ferrous. Accessed 24 Oct. 2020.

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More Definitions for ferrous


How to pronounce ferrous (audio)

English Language Learners Definition of ferrous

technical : of, relating to, or containing iron


fer·​rous | \ ˈfer-əs How to pronounce ferrous (audio) \

Medical Definition of ferrous

1 : of, relating to, or containing iron
2 : being or containing iron with a valence of two

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