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1. A large expanse of ice covering a mountainous region and consisting of several interconnected glaciers.
2. An extensive area of ice on the surface of the ocean, consisting of multiple ice floes and covering an area that is greater than 10 kilometers (6 miles) across.
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) a very large flat expanse of ice floating in the sea; large ice floe
2. (Physical Geography) a large mass of ice permanently covering an extensive area of land
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a large sheet of floating ice, larger than an ice floe.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.