spelter

from WordNet (r) 3.0 (2006)

spelter
    n 1: impure zinc containing about three percent lead and other
         impurities (especially in the form of ingots)

from The Collaborative International Dictionary of English v.0.48

Spelter \Spel"ter\, n. [Cf. LG. spialter, G. & D. spiauter. Cf.
   {Pewter}.] (Metal.)
   Zinc; -- especially so called in commerce and arts.
   [1913 Webster]