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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English niter, nitere, nitre, nytre, from Old French nitre, from Latin nitrum (“native soda, natron”), from Ancient Greek νίτρον (nítron). Ultimately from Egyptian nṯrj (“natron”). Doublet of natron and trona. Compare also natrium, nitrogen.
potassium nitrate, saltpeter, saltpetre, nitre
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Classic usage
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