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From Biology-Online Dictionary
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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.

Origin: L. Cor, heart

4. The pupil (of the eye).

Origin: g. Kore, pupil