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cast-iron

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

First recorded in 1655–65

cast iron

noun
  1. 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.
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Origin of cast iron

1655–65; cast (past participle of cast) + iron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for cast-iron

cast iron

noun
  1. iron containing so much carbon (1.7 to 4.5 per cent) that it cannot be wrought and must be cast into shape
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adjective cast-iron
  1. made of cast iron
  2. rigid, strong, or unyieldinga cast-iron decision
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for cast-iron

cast iron

n.

1660s, from cast (past participle adjective) "made by melting and being left to harden in a mold" (1530s), from past participle of cast (v.) in sense "to throw something in a particular way" (c.1300), especially "form metal into a shape by pouring it molten" (1510s). From 1690s as an adjective, cast-iron.

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Online Etymology Dictionary, © 2010 Douglas Harper