- 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.
- made of cast iron.
- not subject to change or exception: a cast-iron rule.
- hardy: a cast-iron stomach.
- iron containing so much carbon (1.7 to 4.5 per cent) that it cannot be wrought and must be cast into shape
- made of cast iron
- rigid, strong, or unyielding
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