Cast-iron meaning

A hard, brittle, nonmalleable iron-carbon alloy, cast into shape, containing 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus.
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Made of cast iron.
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Rigid; inflexible.

A cast-iron rule.

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Exceptionally strong or resistant.

A cast-iron stomach.

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A hard, unmalleable alloy of iron used for casting: it contains a high proportion of carbon and silicon, has low tensile strength, and is very fluid and fusible when molten.
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Made of cast iron.
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Very hard, rigid, strong, healthy, etc.
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(not comparable) Made of cast iron.

I use a castiron skillet for frying pancakes.

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Ernest has a cast-iron constitution and never gets sick.

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Inflexible or without exception.

The school's cast-iron policy on admissions fees left no leeway for needy students.

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A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.

Cast iron is popular for cookware where an even heating temperature is important.

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Alternative spelling of cast iron.
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Alternative spelling of cast iron.
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Origin of cast-iron

  • Derived from the casting of this form of iron. See wrought iron for comparison
    From Wiktionary