- potassium carbonate (esp. when obtained from wood ashes)
- potassium hydroxide
- any substance containing potassium; esp., salts derived from natural brines, distillery waste, flue dusts of blast furnaces, etc., whose potassium content is expressed in terms of KO: used in fertilizers, soaps, etc.
Origin of potashearlier in plural , potashes ; from Dutch potasschen ; from pot, pot + asch, ash: origin, originally prepared by evaporating the lixivium of wood ashes in iron pots
- See potassium carbonate.
- See potassium hydroxide.
- Any of several compounds containing potassium, especially soluble compounds such as potassium oxide, potassium chloride, and various potassium sulfates, used chiefly in fertilizers.
Origin of potashFrom sing. of obsolete pot ashes, an alkaline substance obtained by leaching wood ashes and evaporating the leachate in a pot.
(countable and uncountable, plural potashes)
- the water-soluble part of the ash formed by burning plant material; used for making soap, glass and as a fertilizer
- (chemistry) an impure form of potassium carbonate (K2CO3) mixed with other potassium salts
- (chemistry, archaic) in the names of compounds of the form "... of potash", potassium (for example, "permanganate of potash" = potassium permanganate)