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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from translingual Glaucus, from Latin glaucus, from Ancient Greek γλαῦκος (glaûkos, “blue-grey fish”), from γλαυκός (glaukós, “blue-green, blue-grey”).
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Classic usage
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