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From The Collaborative International Dictionary of English v.0.48:
Alkaline \Al"ka*line\ (?; 277), a. [Cf. F. alcalin.] Of or pertaining to an alkali or to alkalies; having the properties of an alkali. [1913 Webster] Alkaline earths, certain substances, as lime, baryta, strontia, and magnesia, possessing some of the qualities of alkalies. Alkaline metals, potassium, sodium, c[ae]sium, lithium, rubidium. Alkaline reaction, a reaction indicating alkalinity, as by the action on limits, turmeric, etc. [1913 Webster]