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ice·capor ice cap (īs′kăp′)
An extensive dome-shaped or platelike perennial cover of ice and snow that spreads out from a center and covers a large area, especially of land or a polar region.
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.