The Collaborative International Dictionary of English v.0.48:
Eos \E"os\, n. [L., fr. Gr. 'Hw`s.] (Gr. Myth.) Aurora, the goddess of morn. [1913 Webster]WordNet (r) 3.0 (2006):
Eos n 1: (Greek mythology) the winged goddess of the dawn in ancient mythology; daughter of Hyperion; identified with Roman Aurora