Reference > American Heritage® > Dictionary > Mitanni CONTENTS · INDEX · ILLUSTRATIONS · BIBLIOGRAPHIC RECORD The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. Mitanni SYLLABICATION: Mi·tan·ni PRONUNCIATION: m[Image]-t[Image]n´[Image], -tä´n[Image] An ancient kingdom of northwest Mesopotamia extending from the bend in the Euphrates River nearly to the Tigris River. Founded probably by Aryans, the kingdom was established c. 1475 b.c. and lasted until c. 1275, when it fell to the Hittites. OTHER FORMS: Mi·tan´ni·an — ADJECTIVE — NOUN The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved.