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  1. Dictionary
    cast iron
    /ˌkɑːst ˈʌɪən/

    noun

    • 1. a hard, relatively brittle alloy of iron and carbon which can be readily cast in a mould and contains a higher proportion of carbon than steel (typically 2–4.3 per cent).
    • 2. firm and unchangeable: "there are no cast-iron guarantees"