| a. | 1. | Of or pertaining to an alkali or to alkalies; having the properties of an alkali.
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| Adj. | 1. | alkaline - relating to or containing an alkali; having a pH greater than 7; "alkaline soils derived from chalk or limestone" Synonyms: alkalic Antonyms: acidic - being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) amphiprotic, amphoteric - having characteristics of both an acid and a base and capable of reacting as either |