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Mandrel

mandril

1. The shaft or spindle to which a tool is attached and by means of which it is rotated.

Synonym: mandrin.

3. In dentistry, an instrument used in a handpiece to hold a disk, stone, or cup used for grinding, smoothing, or finishing.

Origin: g. Mandra, a stable; the bed in which a rings stone is set Any of various rotating shafts that serve as axes for larger rotating parts.