Definition of lye noun from the Oxford Advanced Learner's Dictionary

 

lye

 noun
noun
BrE BrE//laɪ//
 
; NAmE NAmE//laɪ//
 
[uncountable]
 
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a chemical used in various industrial processes, including washing Word Origin Old English lēag, of Germanic origin: related to Dutch loog, German Lauge, also to lather.
See the Oxford Advanced American Dictionary entry: lye