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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| sand bar | |
| —n | |
| a ridge of sand in a river or sea, built up by the action of tides, currents, etc, and often exposed at low tide | |