Definition of speiss in US English:

speiss

noun

  • A mixture of impure arsenides and antimonides of nickel, cobalt, iron, and other metals, produced in the smelting of cobalt and other ores.

    • ‘Mattes and speiss are also used as collector in smelts.’

Origin

Late 18th century: from German Speise ‘food, amalgam’.

Pronunciation

speiss

/spīs/