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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English boras, from Anglo-Norman boreis, from Medieval Latin borax, baurach (“borax”), from Arabic بَوْرَق (bawraq), from Middle Persian bwlk' (bōrag), which yielded Persian بوره (bure).
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Classic usage
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