cast iron

Origin

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

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Cast iron is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Dictionary.com Unabridged

cast-i·ron

[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. 2012.
Cite This Source Link To cast iron
Collins
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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