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English definition of “alkali”

alkali

noun [C or U] uk   /ˈæl.kəl.aɪ/ (plural alkalis) specialized us  
a substance that has the opposite effect or chemical behaviour to an acid
alkaline
adjective uk   /ˈæl.kəl.aɪn/ us  
Some plants will not grow in very alkaline soils.
(Definition of alkali from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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