Gender Feminine Usage Greek Mythology (Latinized) Scripts Ἀρέθουσα(Ancient Greek) Meaning & History From Greek Ἀρέθουσα (Arethousa) meaning "quick water", which is possibly derived from ἄρδω (ardo) meaning "water" and θοός (thoos) meaning "quick, nimble". This was the name of a nymph in Greek mythology who was transformed into a fountain.