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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. |
| calcium chloride | |
| —n | |
| a white deliquescent salt occurring naturally in seawater and used in the de-icing of roads and as a drying agent. Formula: CaCl2 | |
| calcium chloride
A white crystalline salt that attracts water very strongly. It is used in refrigeration and is spread on roads to melt ice and control dust. Chemical formula: CaCl2. |