Cambridge Advanced Learner's Dictionary
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Definition
alkali noun
/ˈæl.kəl.aɪ/ n [C or U] (plural alkalis or alkalies) specialized
a substance which has the opposite effect or chemical behaviour to an acid
alkaline
adjective
/ˈæl.kəl.aɪn/ adj
Some plants will not grow in very alkaline soils.
(Definition of alkali noun from the Cambridge Advanced Learner's Dictionary)
