Outer Hebrides See Hebrides.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.Outer Hebrides pl n (Placename) See Hebrides Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Heb?ri?des (?h?b r??diz) n.pl. a group of islands (Inner Hebrides and Outer Hebrides) off the W coast of and belonging to Scotland. 29,615; ab. 2900 sq. mi. (7500 sq. km).Also called Western Isles. Heb`ri?de?an, adj., n. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.