1. a thick layer of ice that permanently covers a large area of land, especially in polar regions

Examples

• The polar icecap is melting due to climate change.
• Scientists study the Antarctic icecap to understand global warming.
• The Greenland icecap contains vast amounts of frozen water.
• Satellite images show the shrinking Arctic icecap.
• The icecap reflects sunlight back into space.
• Researchers drilled deep into the icecap to extract ice cores.