castiron

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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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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