Am·mon·ite [ámm? n?t] (plural Am·mon·ites) noun member of Semitic people in Bible: a member of an ancient Semitic people in the Bible who lived between the Syrian desert and the Jordan River between the 13th and 6th centuries bc. They were constant enemies of the Israelites. [Mid-16th century. < late Latin < Hebrew 'Amm?n "Ammon (son of Lot)"]