mandrel

Meanings

1. A round object used as an aid for shaping a material, e.g. shaping or enlarging a ring, or bending or enlarging a pipe without creasing or kinking it.
2. A tool or component of a tool that guides, grips or clamps something, such as a workpiece to be machined, a machining tool or a part while it is moved.

1. To shape with a mandrel.

Etymology

From French mandrin, probably from Vulgar Latin *mamphurinum, from Latin mamphur (“a bow drill”), ultimately from Oscan or Ancient Greek μαννοφόρον (mannophóron, “wearing a collar”), from μανά (maná, “collar”) + φέρω (phérō, “to bear”); first element cognate with Latin monile (“collar”).