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Related to ice sheet: Laurentide ice sheet
A large sheet of ice and snow that covers an entire region and spreads out under its own weight.
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.
(Physical Geography) a thick layer of ice covering a large area of land for a long time, esp those in Antarctica and Greenland
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a thick sheet of ice covering an extensive area for a long time.
2. a glacier covering a large fraction of a continent.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
An immense mass of ice covering a large land area.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited