Electra Syllabification: (E·lec·tra)Pronunciation: /iˈlektrə/ Greek MythologyDefinition of Electra the daughter of Agamemnon and Clytemnestra. She persuaded her brother Orestes to kill Clytemnestra and Aegisthus (their mother’s lover) in revenge for the murder of Agamemnon. Electra in other Oxford dictionaries Definition of Electra in the British & World English dictionary