a thick cover of ice over an area, sloping in all directions from the center.

1850–55; ice + cap1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
icecap (ˈaɪsˌkæp)
a thick mass of glacial ice and snow that permanently covers an area of land, such as either of the polar regions or the peak of a mountain

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
icecap   (īs'kāp')  Pronunciation Key 
  1. A dome-shaped body of ice and snow that covers a mountain peak or a large area and spreads out under its own weight. Ice caps have an area of less than 50,000 square km (19,500 square mi). Compare ice sheet.

  2. A polar cap.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Called katabatic winds, they are pulled down the slope of the icecap by gravity.
All of this happens much more slowly than icecap melting would go, if it were to happen.
Basically, we're building the world's largest particle detector out of the polar icecap itself.
They buried this region under an immense icecap which was probably a mile thick.
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