A strongly alkaline solution, typically of potassium hydroxide or sodium hydroxide, used for washing, cleansing, or in various manufacturing processes.

The soap maker carefully mixed the lye with water to create a solution for the cold-process soap.

A solid caustic, such as sodium hydroxide, used in making soap and for cleaning.

The drain cleaner contained lye, which effectively cleared the clogged pipes.

lyeadjektiv

Made with, containing, or relating to lye (a strong alkali).

She prefers lye soap for its traditional cleansing properties.