[ kast-ahy-ern, kahst- ]
/ ˈkæstˈaɪ ərn, ˈkɑst- /


made of cast iron.
not subject to change or exception: a cast-iron rule.
hardy: a cast-iron stomach.

Origin of cast-iron

First recorded in 1655–65

Definition for cast-iron (2 of 2)

cast iron


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 of cast iron

1655–65; cast (past participle of cast) + iron Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for cast-iron

British Dictionary definitions for cast-iron

cast iron


iron containing so much carbon (1.7 to 4.5 per cent) that it cannot be wrought and must be cast into shape

adjective cast-iron

made of cast iron
rigid, strong, or unyieldinga cast-iron decision
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