Gr. Myth. a sorceress who helps Jason get the Golden Fleece and, later, when deserted by him, kills their children
See Medea in American Heritage Dictionary 4
(mĭ-dēˈə)
noun Greek Mythology
A princess and sorceress of Colchis who helped Jason obtain the Golden Fleece, lived as his consort, and killed their children as revenge for his infidelity.