Agag (â'găg), flame. 1. The name or title of a powerful king of the Amalekites, who was contemporary with Moses. Numbers 24:7.. An Amalekite king, who was conquered by Saul, and put to death by Samuel for his cruelty. 1 Samuel 1:15-33. The term "Agagite" signifies an Amalekite. Esther 3:1, Esther 3:10, Esther 8:3, Esther 8:5.