Definition of alkali noun from the Oxford Advanced American Dictionary

 

alkali

 noun
noun
NAmE//ˈælkəˌlaɪ//
 
[countable, uncountable](chemistry)
 
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a chemical substance that reacts with acids to form a salt and gives a solution with a pH of more than seven when it is dissolved in water compare acid
See the Oxford Advanced Learner's Dictionary entry: alkali