Толковый словарь английского языка Oxford English Reference - alkali
Alkali
alkali
n. (pl. alkalis) 1 a any of a class of substances that liberate hydroxide ions in water, usu. form caustic or corrosive solutions, turn litmus blue, and have a pH of more than 7, e.g. caustic soda. b any other substance with similar but weaker properties, e.g. sodium carbonate. 2 Chem. any substance that reacts with or neutralizes hydrogen ions. Phrases and idioms alkali metals any of the univalent group of metals, lithium, sodium, potassium, rubidium, and caesium, whose hydroxides are alkalis. Derivatives alkalimeter n. alkalimetry n. Etymology: ME f. med.L, f. Arab. al-kali calcined ashes f. kala fry
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1.
noun (plural -lies or -lis) Etymology: Middle English, from Medieval Latin, from Arabic al-qili the ashes of the plant saltwort Date: 14th century a soluble salt obtained from the ashes of plants and consisting largely of potassium or sodium carbonate, ~ metal, a soluble salt or a mixture of soluble salts present in some soils of arid regions in quantity detrimental to agriculture ...Толковый словарь английского языка
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