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  1. Dictionary
    Cast i·ron
    /ˈkast ˌīərn/

    noun

    • 1. a hard, relatively brittle alloy of iron and carbon that can be readily cast in a mold and contains a higher proportion of carbon than steel (typically 2.0–4.3 percent).
    • 2. firm and unchangeable: "there are no cast-iron guarantees"

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