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Adjective cast iron has 1 sense
  1. cast-iron, iron - extremely robust; "an iron constitution"
    Antonym: frail (indirect, via robust)
,Noun cast iron has 1 sense
  1. cast iron - an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting
    --1 is a kind of     iron, Fe, atomic number 26
    --1 has substance: pearlite; pig iron
    --1 has particulars: alloy iron, alloy cast iron; pot metal
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