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polar cap

Geology. the icecap situated at either end of the earth's poles.
Astronomy. either of the two bright areas around the poles of the planet Mars, consisting of water ice and frozen carbon dioxide.
Origin of polar cap
1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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polar-cap in Science
polar cap  
  1. The mass of ice that covers either of the Earth's polar regions year-round.

  2. The mass of frozen carbon dioxide and water that covers either of Mars's polar regions.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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