tap / space
Classic usage
Pronunciation: /ˈpɑt.æʃ/
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From pot + ash, because the substance was originally obtained by leaching ash in water and then boiling down the resulting solution in a pot. Compare Dutch potas, German Pottasche.
caustic potash, potassium hydroxide
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tap / space
Classic usage
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