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
Kaitlyn Yarborough, Southern Living, 2 Sep. 2025
Heat a grill pan or large cast-iron skillet over high.
—Sabrina Weiss, People.com, 31 Aug. 2025
Alicia Geigel, Southern Living, 28 Aug. 2025
Original price: $99.99 This six-quart cast-iron Dutch oven is made from heavy-duty cast iron with an easy-to-clean enamel coating.
—Nora Colomer
May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 27 Aug. 2025
See All Example Sentences for cast-iron
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Adjective
Growing up in the South, there are unspoken protocols that take place in many kitchens far and wide, such as never, ever putting your cast-iron skillet in the dishwasher and that most meals aren't truly complete unless there is some form of a biscuit, piece of cornbread, or yeast roll on the plate.
—Kaitlyn Yarborough, Southern Living, 2 Sep. 2025
Heat a grill pan or large cast-iron skillet over high.
—Sabrina Weiss, People.com, 31 Aug. 2025
Noun
It’s constructed with durable cast iron and finished with a porcelain enamel glaze that protects the inside from chipping, scratching, and fading with use.
—Alicia Geigel, Southern Living, 28 Aug. 2025
Original price: $99.99 This six-quart cast-iron Dutch oven is made from heavy-duty cast iron with an easy-to-clean enamel coating.
—Nora Colomer
May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 27 Aug. 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 7 Sep. 2025.
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