E·os (???s?)n. Greek Mythology The goddess of the dawn.[Greek ??s, from ??s, dawn; see aus- in Indo-European roots.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Eos (?i??s) n (Classical Myth & Legend) Greek myth the winged goddess of the dawn, the daughter of Hyperion. Roman counterpart: Aurora Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014E?os (?i ?s) n. the ancient Greek goddess of the dawn. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.