Slag, v. i. & t. [imp. & p. p. Slagged p. pr. & vb. n. Slagging.] Metal. To form, or form into, a slag; to agglomerate when heated below the fusion point.
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slag
n : the scum formed by oxidation at the surface of molten metals
[syn: scoria, dross]
[also: slagging, slagged]