a lustrous, crystalline pig iron containing a large amount of manganese, sometimes 15 percent or more, used in making steel.
Also called spiegel, spiegel iron.

1865–70; < German, equivalent to Spiegel mirror + Eisen iron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spiegeleisen (ˈspiːɡəlˌaɪzən)
a type of pig iron that is rich in manganese and carbon
[C19: German, from Spiegel mirror + Eiseniron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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