cast iron
US /ˌkæst ˈaɪərn/
UK /ˌkæst ˈaɪərn/

1.
a hard, brittle, nonmalleable alloy of iron, carbon, and silicon, cast in a mold
:
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The old bridge was made of cast iron.
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She cooked dinner in a heavy cast iron skillet.
1.
made of cast iron
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He bought a new cast iron stove.
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The antique shop had many beautiful cast iron decorations.