Mandrel (noun)

1. A tool or device that is used to hold and shape a workpiece while it is being machined or formed.
2. A cylindrical rod or bar that is used as a support for a workpiece while it is being machined or formed.

Origin:

From the french word "mandrillus" meaning "small handle".

Examples:

1. A mandrel is used to hold and shape a pipe while it is being bent.
2. The mandrel was inserted into the pipe to give it the desired shape.
3. The jeweler used a mandrel to shape the ring to fit the customer's finger.
4. The mandrel was the key piece of equipment in the process of making the gears.
5. The workpiece was held in place on the mandrel while it was being drilled.