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
The retreat of the polar ice cap is making the region easier to work in, and
  there is thought to be lots of oil and gas to tap.
The high gas concentration is thought to be because of the enormous weight and
  pressure of the continental ice cap.
The ice cap is not the remains of glaciers, never mind yearly, seasonal
  turnover rates.
Ice cap or whatever maintains that there's this flood of money going into
  climate science.
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