Lye /(?)/

Lye

n.
  1. A strong caustic alkaline solution of potassium salts, obtained by leaching wood ashes. It is much used in making soap, etc.
  2. Sodium hydroxide or potassium hydroxide, or a concentrated aqueous solution of either compound. (Chem.)

Lye

n.
  1. A short side line, connected with the main line; a turn-out; a siding. (Railroad) [Eng.]

Lye

n.
  1. A falsehood. [Obs.]