Gr. Myth. the son of Thyestes and lover of Clytemnestra: he helps her to kill her husband, Agamemnon
Origin of AegisthusClassical Latin ; from Classical Greek Aigisthos
The son of Thyestes and lover of Clytemnestra. He helped Clytemnestra kill her husband Agamemnon upon Agamemnon's return from the Trojan War.