Endymion Syllabification: (En·dym·i·on)Pronunciation: /enˈdimēən/ Greek MythologyDefinition of Endymion a remarkably beautiful young man, loved by the Moon (Selene). According to one story, he was put in an eternal sleep by Zeus for having fallen in love with Hera, and was then visited every night by Selene. Endymion in other Oxford dictionaries Definition of Endymion in the British & World English dictionary