potass

/P AH0 T AE1 S/
noun
  1. 1

    (dated, pharmacology) potassium

  2. 2

    Obsolete form of potash. [The water-soluble part of wood ash, used for making soap and glass and as a fertilizer (chemically speaking, an impure form of potassium carbonate (Kโ‚‚COโ‚ƒ) mixed with other potassium salts).]