Se·vas·to·pol (s?-v?s?t?-p?l?, s?v??-st??p?l) Formerly Se·bas·to·pol (s?-b?s?t?-p?l?) A city of southern Ukraine in Crimea on the Black Sea west of Yalta. Founded on the site of an ancient Greek colony, it became Russia’s principal Black Sea naval base after the late 18th century. The city resisted lengthy sieges during the Crimean War and World War II.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.Sevastopol (Russian s?vas?t?p?lj) n (Placename) a port, resort, and naval base in the Crimea, on the Black Sea: captured and destroyed by British, French, and Turkish forces after a siege of 11 months (1854?55) during the Crimean War; taken by the Germans after a siege of 8 months (1942) during World War II. Pop: 338 000 (2005 est). English name: Sebastopol Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Se?vas?to?pol (s??væs t??po?l) also Sebastopol n. a seaport in the S Crimea, in S Ukraine. 361,000. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.