mineral alkali
/ˌmɪn(ə)rəl ˈalkəlʌɪ/ /ˌmɪn(ə)r(ə)l ˈalkəlʌɪ/Chemistry
noun
A soluble inorganic base; especially an alkaline salt of sodium or (in later use) of any metal in group one or two of the periodic table.
Origin
Mid 18th century; earliest use found in Charles Lucas (1713–1771), politician and physician. From mineral + alkali adjective.