spiegeleisen
Concise Oxford English Dictionary © 2008 Oxford University Press:
spiegeleisen /ˈspiːg(ə)lˌʌɪz(ə)n/
▶noun an alloy of iron and manganese, used in steel-making.
– origin C19: Ger., from Spiegel ‘mirror’ + Eisen ‘iron’.
'spiegeleisen' also found in these Oxford entries:

