An Agagite was a member of the house or line of Agag. The term is especially used as a title of reproach for Haman in the Book of Esther.
Haman is repeatedly called an Agagite and is presented as an enemy of the Jews. The supplied material connects the title with Jewish tradition that Israel’s hereditary enemies belonged to the house of Amalek.
The word is formed from Agag and means a member of Agag’s house. Its precise linguistic origin is disputed in the supplied material; one proposed connection relates it to an Assyrian word meaning powerful, vehement, or angry.