Al An·bar (?l ?n?bär?, äl än?-) A region of western Iraq. Consisting largely of arid land in the Syrian Desert, Al Anbar is sparsely populated except for a corridor along the Euphrates River.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.