potash /potˈash/

1. (also, earlier, potˈ-ash and potass /pə-tasˈ, potˈas/) a powerful alkali, potassium carbonate, orig obtained in a crude state by leaching wood ash and evaporating the solution in pots
2. (in pl, usu pot ashes or potˈ-ashes) the original name for the alkali in its crude form
3. Potassium hydroxide (caustic potash)
4. Sometimes the monoxide or (vaguely) some other compound of potassium
5. Potash water

Containing or rich in potassium

To treat with potash

potash alum noun

Alum (qv)

potash water or potass water noun

An aerated water containing potassium bicarbonate

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