spie·gel·ei·sen 
(spēgə-lī′zən)
(spēgə-lī′zən)n.
An alloy of iron containing approximately 15 percent manganese and small quantities of carbon and silicon, used in the Bessemer process.
[German : Spiegel, mirror (from Middle High German, from Old High German spiagal, from Latin speculum; see SPECULUM) + Eisen, iron (from Middle High German īsen, from Old High German īsan; see eis- in the Appendix of Indo-European roots).]
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