Potash

from WordNet (r) 3.0 (2006)

potash
    n 1: a potassium compound often used in agriculture and industry
         [syn: {potash}, {caustic potash}, {potassium hydroxide}]

from The Collaborative International Dictionary of English v.0.48

Potash \Pot"ash`\, n. [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).
       [1913 Webster]