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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. |
passive transfer n.
The transfer of skin-sensitizing antibodies from the blood of an allergic individual to that of a nonallergic individual in order to test for an allergic reaction to specific allergens.