Meaning of ALKALI in English

/ ˈælkəlaɪ; NAmE / noun

[ C , U ] ( chemistry ) 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



late 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.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.