O ‧ res ‧ tes /ɒˈrestiːz $ ɔː-/ BrE AmE
in ancient Greek stories, the son of ↑ Agamemnon , King of ↑ Mycenae , and Clytemnestra. Clytemnestra and her lover Aegisthus kill Agamemnon when Orestes is a child. When he becomes an adult, Orestes kills his mother and Aegisthus.