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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. |
oral surgery n.
The branch of dentistry concerned with the surgical and adjunctive treatment of diseases, injuries, and deformities of the oral and maxillofacial region.