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cast iron

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noun
an alloy of iron, carbon, and other elements, cast as a soft and strong, or as a hard and brittle, iron, depending on the mixture and methods of molding.
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Origin of cast iron

1655–65; cast (past participle of cast) + iron

Other definitions for cast iron (2 of 2)

cast-iron
[ kast-ahy-ern, kahst- ]
/ ˈkæstˈaɪ ərn, ˈkɑst- /

adjective
made of cast iron.
not subject to change or exception: a cast-iron rule.
hardy: a cast-iron stomach.

Origin of cast-iron

First recorded in 1655–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use cast iron in a sentence

British Dictionary definitions for cast iron

cast iron

noun
iron containing so much carbon (1.7 to 4.5 per cent) that it cannot be wrought and must be cast into shape
adjective cast-iron
made of cast iron
rigid, strong, or unyieldinga cast-iron decision
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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