In an aqueous manner; in a way that is watery or relates to water.
From 'aqueous' (containing water) plus the English adverbial suffix '-ly'. This creates an adverb describing actions or states characterized by aqueous qualities.
Scientists might say a substance 'dissolves aqueously' to specify that it's dissolving in water specifically—the word matters because some things dissolve better in oil or other solvents, so precision matters when describing chemical behavior.
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