1. arethusa - Noun
2. Arethusa - Proper noun
any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers
Source: WordNetArtemis pities Arethusa and saves her by transforming Arethusa into a spring in Artemis' temple, Artemis Alphaea in Letrini, where the goddess and her attendant drink. Source: Internet