1. The central mass of necrotic tissue in a boil. 2. A metal casting, usually with a post in the canal of a tooth root, designed to retain an artificial crown. 3. A sectional record, usually of plaster of Paris or one of its derivatives, of the relationships of parts, such as teeth, metallic restorations, or copings. [L. cor, heart]
atomic c. the nucleus plus the nonvalence electrons.
central transactional c. the reticular activating system of the brain.
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