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cast iron
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Quick answer
As a noun, cast iron means an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting. As an adjective, it means extremely robust.
Meanings of cast iron
2 meaningsnoun
An alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting
adjective
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).
Synonyms by meaning
adjective: extremely robust