cast-iron

from WordNet (r) 3.0 (2006)
cast-iron
    adj 1: extremely robust; "an iron constitution" [syn: {cast-
           iron}, {iron}]
from The Collaborative International Dictionary of English v.0.48
Cast-iron \Cast"-i`ron\, a.
   Made of cast iron. Hence, Fig.: like cast iron; hardy;
   unyielding.
   [1913 Webster]
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