'Spelter' definitions:

Definition of 'spelter'

From: WordNet
noun
Impure zinc containing about three percent lead and other impurities (especially in the form of ingots)

Definition of 'Spelter'

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