potash definition by Webster's New World
- 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: earlier in plural , potashes ; from Dutch potasschen ; from pot, pot plush asch, ash: origin, originally prepared by evaporating the lixivium of wood ashes in iron pots
potash definition by American Heritage Dictionary
- 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: Sing. of obsolete pot ashes, translation of obsolete Dutch potaschen (from the fact that this substance was originally obtained by leaching wood ashes and evaporating the leach in a pot).
potash - Medical Definition
potash - Science Definition