Webster’s Revised Unabridged Dictionary · 1913
Lye
Lye (lī), n. [Written also lie and ley.] [AS. leáh; akin to D. loog, OHG. louga, G. lauge; cf. Icel. laug a bath, a hot spring.] A strong caustic alkaline solution of potassium salts, obtained by leaching wood ashes. It is much used in making soap, etc.
Lye, n. (Railroad) A short side line, connected with the main line; a turn-out; a siding. [Eng.]
Lye, n. A falsehood. [Obs.] See Lie.