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1. See potassium carbonate.
2. See potassium hydroxide.
3. Any of several compounds containing potassium, especially soluble compounds such as potassium oxide, potassium chloride, and various potassium sulfates, used chiefly in fertilizers.
[From sing. of obsolete pot ashes, an alkaline substance obtained by leaching wood ashes and evaporating the leachate in a pot.]
1. (Elements & Compounds) another name for potassium carbonate, esp the form obtained by leaching wood ash
2. (Elements & Compounds) another name for potassium hydroxide
3. (Elements & Compounds) potassium chemically combined in certain compounds: chloride of potash.
[C17 pot ashes, translation of obsolete Dutch potaschen; so called because originally obtained by evaporating the lye of wood ashes in pots]
1. potassium carbonate, esp. the crude impure form obtained from wood ashes.
2. potassium hydroxide.
3. any of several potassium compounds, as the oxide of potassium, K2O.
[1615–25; back formation from pl. pot-ashes, translation of early Dutch potasschen]
Any of several chemical compounds that contain potassium, especially potassium carbonate (K2CO3), which is a strongly alkaline material obtained from wood ashes and used in fertilizers.