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
Synonyms
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
The Week Uk, theweek, 10 Nov. 2024
Always lift your cast-iron cookware instead of sliding it to prevent damage.
—Katie Rosenhouse, Southern Living, 5 Nov. 2024
Nicole Kliest, Vogue, 3 Nov. 2024
Cast Iron Set Save on the new 8-piece set of durable cast iron cookware during Caraway’s holiday sale.
—Kasey Caminiti, USA TODAY, 1 Nov. 2024
See all Example Sentences for cast-iron 
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Adjective
Volkswagen employees have long benefited from generous pay deals and cast-iron job security, while resisting all efforts by the management to rein in costs to cope with challenges such as soaring energy prices.
—The Week Uk, theweek, 10 Nov. 2024
Always lift your cast-iron cookware instead of sliding it to prevent damage.
—Katie Rosenhouse, Southern Living, 5 Nov. 2024
Noun
There’s a cast iron tub, a breakfast nook, a kitchen with copper pans, and a master bedroom with French doors.
—Nicole Kliest, Vogue, 3 Nov. 2024
Cast Iron Set Save on the new 8-piece set of durable cast iron cookware during Caraway’s holiday sale.
—Kasey Caminiti, USA TODAY, 1 Nov. 2024
See all Example Sentences for cast-iron
Dictionary Entries Near cast-iron
Cite this Entry
“Cast-iron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cast-iron. Accessed 22 Nov. 2024.
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