Achelois was a name attributed to several figures in Greek mythology. * Achelois (Greek: Ἀχελωίς, English translation: "she who washes away pain") was a minor Greek moon goddess. She was frequently the recipient of sacrifices ordered by the Dodonian Oracle, in order for her subjects to be cured of their ailments. * Achelois was a surname of the Sirens, the daughters of Achelous. * Achelois was a general name for water-nymphs, as in Columella, where the companions of the Pegasids are called Acheloides.