GNU Collaborative International Dictionary of English

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1.       
   Alkaline , 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, cæsium, lithium, rubidium. -- Alkaline reaction, a reaction indicating alkalinity, as by the action on limits, turmeric, etc.
   1913 Webster