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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From French natron, from Spanish natrón, from Arabic نَطْرُون (naṭrūn), from Ancient Greek νίτρον (nítron, “nitre”), ultimately from Egyptian nṯrj (“natron”): R9 Doublet of niter and trona.
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Classic usage
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