Ægis (lit. a goat's skin), the shield of Zeus, made of the hide of the goat Amalthea (q.v.), representing originally the storm-cloud in which the god invested himself when he was angry; it was also the attribute of Athena, bearing in her case the Gorgon's head.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Ægir * Ægis`thus