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n. Chiefly British
An island in a 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.
1. (Physical Geography) an island in a river, lake, or estuary
2. (Physical Geography) low flat land near a river
[Old English holm sea, island; related to Old Saxon holm hill, Old Norse holmr island, Latin culmen tip]
[C14: variant of obsolete holin, from Old English holegn holly]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
2. a small island.
[before 1000; Middle English < Old Norse holm islet, c. Old English holm wave, Old Saxon: hill; akin to hill]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.