Pronunciation (UK) (US) IPA (key): /ˈæ.kwi.əs/ or /ˈeɪ.kwi.əs/ or /ˈɑ.kwi.əs/ Audio (US)(file) Adjective Positive aqueous Comparative none Superlative none Something that is aqueous is related to water. (chemistry) Something that is aqueous contains mostly of water. An aqueous solution.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads