Etymology
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alkaline (adj.)

1670s, "pertaining to alkalis," from alkali + -ine (1). Of soils, from 1850. Related: Alkalinity.

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Definitions of alkaline

alkaline (adj.)
relating to or containing an alkali; having a pH greater than 7;
alkaline soils derived from chalk or limestone
Synonyms: alkalic
From wordnet.princeton.edu