Meaning of “lye” in the English Dictionary

british dictionary

"lye" in British English

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lyenoun [ U ]

uk /laɪ/ us /laɪ/

a highly alkaline substance, usually either sodium hydroxide or potassium hydroxide, that can cause severe damage or burns and is used in making cleaning products

(Definition of “lye” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)