Definition of potash noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈpɒtæʃ//
; NAmE NAmE//ˈpɑːtæʃ//
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a chemical containing potassium, used to improve soil for farming and in making soap Word Originearly 17th cent.: from pot-ashes, from obsolete Dutch potasschen, originally obtained by leaching vegetable ashes and evaporating the solution in iron pots.
See the Oxford Advanced American Dictionary entry: potash