Definition of cast iron in English:

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cast iron

Pronunciation: /ˌkɑːst ˈʌɪən/


[mass noun]
1A hard, relatively brittle alloy of iron and carbon which can be readily cast in a mould and contains a higher proportion of carbon than steel (typically 2-4.3 per cent).
Example sentences
  • It had three keyholes and as many huge keys and was apparently made of cast iron reinforced with steel.
  • There are two other classes of cast iron which are more ductile than gray cast iron.
  • Steel combines something of the strength of wrought iron with the malleability of cast iron.
2 [as modifier] Firm and unchangeable: there are no cast-iron guarantees
More example sentences
  • But it is reluctant to issue a cast-iron guarantee that every contract will meet its target, even though none has fallen short to date.
  • It combines stock market growth potential with a cast-iron guarantee that savers will not lose a penny if the market volatility continues.
  • In this sense, the individual must again decide in each case, giving a cast-iron definition of where they would draw the line.
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