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
Alicia Geigel, Southern Living, 7 Oct. 2025
On Zwilling’s site—which also includes Staub and Demeyere, among other high-end brands—cast-iron, cutlery, and more are deeply discounted.
—Melissa Knific, Bon Appetit Magazine, 7 Oct. 2025
Claire Harmeyer, PEOPLE, 4 Oct. 2025
Give a new pan a glossy black nonstick coating—or bring the luster back to a family heirloom—with this 3-step process for seasoning cast iron.
—Julie Harans, Bon Appetit Magazine, 1 Oct. 2025
See All Example Sentences for cast-iron
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Adjective
Other Southern Living favorites, like cast-iron skillets and stainless steel cookware sets from Lodge and Cuisinart also got discounted for the event.
—Alicia Geigel, Southern Living, 7 Oct. 2025
On Zwilling’s site—which also includes Staub and Demeyere, among other high-end brands—cast-iron, cutlery, and more are deeply discounted.
—Melissa Knific, Bon Appetit Magazine, 7 Oct. 2025
Noun
They’re made with the brand’s signature enameled cast iron, which allows for consistent heat distribution and is oven-safe up to 500 degrees Fahrenheit.
—Claire Harmeyer, PEOPLE, 4 Oct. 2025
Give a new pan a glossy black nonstick coating—or bring the luster back to a family heirloom—with this 3-step process for seasoning cast iron.
—Julie Harans, Bon Appetit Magazine, 1 Oct. 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 10 Oct. 2025.
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