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: made of cast iron
: resembling cast iron: such as
: capable of withstanding great strain
a cast-iron stomach
: not admitting change, adaptation, or exception : rigid
a cast-iron will
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

cast iron

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: 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
If grilling isn't an option, a cast-iron skillet is a great tool for cooking steak at home. Cailey Rizzo, Travel + Leisure, 24 June 2024 Wait for a wisp of smoke, then use tongs to hold the steak perpendicular to the cast-iron and gently sear the fat cap until some of the fat renders, about 2 minutes. Eric Kim, San Diego Union-Tribune, 12 June 2024
Now’s the time to save on beautiful stoneware mugs, useful cast iron skillets, and colorful Dutch ovens right at the height of summer. Amber C. Snider, Peoplemag, 4 July 2024 This skillet will be well worth the money, since the durable cast iron material will last for years of cooking. Lauren Taylor, Better Homes & Gardens, 25 June 2024 See all Example Sentences for cast-iron 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'cast-iron.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use


1692, in the meaning defined at sense 1


1664, in the meaning defined above

Time Traveler
The first known use of cast-iron was in 1664

Dictionary Entries Near cast-iron

Cite this Entry

“Cast-iron.” Dictionary, Merriam-Webster, Accessed 17 Jul. 2024.

Kids Definition

cast iron

: a hard brittle alloy of iron, carbon, and silicon shaped by being poured into a mold while melted
Last Updated: - Updated example sentences
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