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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Old French porfire, from Ancient Greek πορφυρίτης λίθος (porphurítēs líthos, “purple stone”), from πορφύρα (porphúra, “purple-fish, purple dye”).
porphyritic rock
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Classic usage
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