From The Collaborative International Dictionary of English v.0.44 [gcide]:
Potash \Pot"ash'\, noun [Pot + ash.] (Chem.) (a) The hydroxide of potassium hydrate, a hard white brittle substance, {KOH}, having strong caustic and alkaline properties; -- hence called also {caustic potash}. (b) The impure potassium carbonate obtained by leaching wood ashes, either as a strong solution (lye), or as a white crystalline (pearlash).
From WordNet (r) 2.0 [wn]:
noun
1: a potassium compound often used in agriculture and industry [syn: {caustic potash}, {potassium hydroxide}]
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