Tro·bri·and Islands (tr??br?-?nd?, -änd?) An island group of Papua New Guinea in the Solomon Sea off eastern New Guinea. The islands were occupied by Allied forces in June 1943.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.Trobriand Islands pl n (Placename) a group of coral islands in the Solomon Sea, north of the E part of New Guinea: part of Papua New Guinea. Area: about 440 sq km (170 sq miles) Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Tro?bri?and Is?lands (?tro? bri??nd, -?ænd) n.pl. a group of islands in the SW Pacific, off SE New Guinea: part of Papua New Guinea. 170 sq. mi. (440 sq. km). Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.