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Definition of: potash
(pot′ash′) noun
1. Potassium hydroxide: also called caustic potash or potassa.
2. The crude potassium carbonate obtained by leaching the ashes of plants: when purified it is called pearl ash.
3. The oxide of potassium, K2O.
4. Potash water. Also, in pharmaceutical use, po·tass (pə·tas′). [Earlier potashes, pl., after Du. potasschen; from being prepared in iron pots]
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