1
: made of cast iron
2
: resembling cast iron: such as
a
: capable of withstanding great strain
a cast-iron stomach
b
: not admitting change, adaptation, or exception : rigid
a cast-iron will
c
British
: not likely to fail or be broken : airtight
"Clever idea, Black, getting yourself seen on a safe station platform … gave you a cast-iron excuse not to leave your hidey-hole in future, didn't it?"—
J. K. Rowling
J. K. Rowling
: a commercial alloy of iron, carbon, and silicon that is cast in a mold and is hard, brittle, nonmalleable, and incapable of being hammer-welded but more easily fusible than steel
Examples of cast-iron in a Sentence
Adjective
lost weight only after a cast-iron adherence to his diet
he has a cast-iron faith in his innate ability to overcome any adversity that life might throw against him
Noun
The fence is made of cast iron.
Recent Examples on the Web
Tara Massouleh McCay, Southern Living, 22 Mar. 2025
The list of additional products affected by counter-tariffs includes tools, computers and servers, display monitors, water heaters, sport equipment, and cast-iron products.
—Rob Gillies, Chicago Tribune, 12 Mar. 2025
Isabel Garcia, People.com, 26 Mar. 2025
He's also developed a neat sideline in collecting and restoring cast iron skillets, with videos of his efforts regularly posted to Instagram under the handle castiron_kyle and hosts the Full Slice Pod with two of his friends.
—Thomas G. Moukawsher, Newsweek, 21 Mar. 2025
See All Example Sentences for cast-iron
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Adjective
Built in 1851, the Victorian-era mall is older than the state itself and is the oldest cast-iron market in the country.
—Tara Massouleh McCay, Southern Living, 22 Mar. 2025
The list of additional products affected by counter-tariffs includes tools, computers and servers, display monitors, water heaters, sport equipment, and cast-iron products.
—Rob Gillies, Chicago Tribune, 12 Mar. 2025
Noun
Keep scrolling to shop more of the best deals on Lodge cast iron cookware and accessories, then check out more discounts at Amazon's Big Spring Sale.
—Isabel Garcia, People.com, 26 Mar. 2025
He's also developed a neat sideline in collecting and restoring cast iron skillets, with videos of his efforts regularly posted to Instagram under the handle castiron_kyle and hosts the Full Slice Pod with two of his friends.
—Thomas G. Moukawsher, Newsweek, 21 Mar. 2025
See All Example Sentences for cast-iron
Cite this Entry
“Cast-iron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cast-iron. Accessed 2 Apr. 2025.
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