from
The Collaborative International Dictionary of English v.0.48
Smelt \Smelt\, v. t. [imp. & p. p. {Smelted}; p. pr. & vb. n.
{Smelting}.] [Of foreign origin; cf. Sw. sm[aum]lta, D.
smelten, Dan. smelte, Icel. smelta, G. schmelzen OHG.
smelzan, smelzen; probably akin to Gr. ?????. Cf. {Enamel},
{Melt}, {Mute}, v. i., {Smalt}.] (Metal.)
To melt or fuse, as, ore, for the purpose of separating and
refining the metal; hence, to reduce; to refine; to flux or
scorify; as, to smelt tin.
[1913 Webster]