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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| ice sheet | |
| —n | |
| a thick layer of ice covering a large area of land for a long time, esp those in Antarctica and Greenland | |
| ice sheet
A large sheet of ice and snow that covers an entire region and spreads out under its own weight. Ice sheets have an area of more than 50,000 square km (19,500 square mi). Compare icecap. |