(n)(Greek mythology) the seducer of Clytemnestra and murderer of Agamemnon who usurped the throne of Mycenae until Agamemnon's son Orestes returned home and killed him
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
‖n. [ L. aegis, fr. Gr. a'igi`s a goat skin, a shield, a'i`x goat, or fr. 'ai`:ssw to rush. ] A shield or protective armor; -- applied in mythology to the shield of Jupiter which he gave to Minerva. Also fig.: A shield; a protection. [ 1913 Webster ]