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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Ancient Greek σιδηρίτης (sidērítēs, “made of iron”), from Ancient Greek σίδηρος (sídēros, “iron”), or from Latin sideritis (“lodestone”), from Ancient Greek σιδηρῖτις (sidērîtis, “loadstone”). By surface analysis, sider- + -ite.
chalybite
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Classic usage
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