1
: the freezing of the surface of liquid metal during the pouring of an ingot or casting due to interrupted or improper pouring
also
: an imperfection thus caused
2
: the imperfect weld caused in a forging by the inadequate heat of one surface under working or by an oxide film
3
: a split ring or link used to mend or fasten chains
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Merriam-Webster unabridged
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