cast iron

noun
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.

Origin:
1655–65; cast (past participle of cast1) + iron

Dictionary.com Unabridged

cast-iron

[kast-ahy-ern, kahst-]
adjective
1.
made of cast iron.
2.
not subject to change or exception: a cast-iron rule.
3.
hardy: a cast-iron stomach.

Origin:
1655–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cast iron
 
n
1.  iron containing so much carbon (1.7 to 4.5 per cent) that it cannot be wrought and must be cast into shape
 
adj
2.  made of cast iron
3.  rigid, strong, or unyielding: a cast-iron decision

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

cast iron
1660s, from cast (pp. adj.) "made by melting and being left to harden in a mold" (1530s), from cast (v.) in sense "to throw something in a particular way" (c.1300).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These types of cast iron pans are easy to use due to its lightweight quality.
Aging pipes are often replaced with more earthquake-resistant
  magnesium-reinforced cast iron.
Cast iron, even enamel-coated cast iron, are suitable.
We are looking into the use of cast iron detectable warnings.
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