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



BrE BrE//ˈælkəlaɪ//
; NAmE NAmE//ˈælkəlaɪ//
[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 Word Originlate Middle English (denoting a saline substance derived from the ashes of various plants, including glasswort, a salt-marsh plant formerly used to make glass): from medieval Latin, from Arabic al-qalī ‘calcined ashes (of the glasswort etc.), reduced through exposure to strong heat’, from qalā ‘fry, roast’.
See the Oxford Advanced American Dictionary entry: alkali