Eos

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The goddess of the dawn.

from The Century Dictionary.

• noun In Gr. mythology, the goddess of the dawn, who brings up the rosy light of day from the east: same as the Roman Aurora. She was represented in art and poetry as a young and beautiful winged maiden.
• noun [NL.] A genus of lories, by some ranked only as a section of Domicella, containing several species, as E. histrio, E. rubra, E. cardinalis, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Gr. Myth.) Aurora, the goddess of morn.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun Greek mythology The Greek goddess of the dawn; daughter of Hyperion and Theia, sister of Helios and Selene, wife of Astraeus (god of the dusk), and mother of the four Anemoi ("Winds"), and the five Astra Planeta ("Wandering Stars/Planets"). Her Roman counterpart is Aurora.
• proper noun poetic the dawn
• proper noun A taxonomic genus within the subfamily Loriinae — lorikeets of Indonesia with predominantly red plumage and blue, purple or black markings.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (Greek mythology) the winged goddess of the dawn in ancient mythology; daughter of Hyperion; identified with Roman Aurora