Narcissus Syllabification: (Nar·cis·sus)Pronunciation: /närˈsisəs/ Greek MythologyDefinition of Narcissus a beautiful youth who rejected the nymph Echo and fell in love with his own reflection in a pool. He pined away and was changed into the flower that bears his name. Narcissus in other Oxford dictionaries Definition of Narcissus in the British & World English dictionary