In a manner relating to or resembling alkali; with alkaline properties or effects.
Derived from alkali + -ative (forming adjectives of relation) + -ly (adverbial suffix). This term is rare in modern usage but follows standard English word formation patterns.
Alkatively is the kind of word that should exist more often—it lets you describe how something acts in an alkaline way, but chemistry and English decided to just use 'alkaline' instead, leaving perfectly good adverbs unused.
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