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