Etymology

spiegeleisen

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Today it means: A ferromanganese alloy containing approximately 15% manganese and small quantities of carbon and silicon. Full definition →

German Spiegeleisen
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The story

  1. German · borrowed fromSpiegeleisen
  2. English todayspiegeleisen

From German Spiegeleisen (literally “mirror iron”).

Etymology from Wiktionary, CC BY-SA 4.0.