Mo·sul (m?-so?ol?, m??s?l) A city of northern Iraq on the Tigris River north-northwest of Baghdad. An important center on the historical caravan route across northern Mesopotamia, it became part of the Ottoman Empire in the 1500s. Mosul was awarded to Iraq by the League of Nations in 1926.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.Mosul (?m??s?l) n (Placename) a city in N Iraq, on the River Tigris opposite the ruins of Nineveh: an important commercial centre with nearby Ayn Zalah oilfield; university. Pop: 1 236 000 (2005 est)Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Mo?sul (mo??sul) n. a city in N Iraq, on the Tigris, opposite the ruins of Nineveh. 664,221. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.