Popularly, the name is used for any papal document that contains a metal seal.

While it used to always bear a metal seal, it now does so only on the most solemn occasions.

It appeared to be full of large black beads, like olives, and had a complicated metal seal.

Its top was held down with a complicated metal seal and it appeared to contain large black beads.

"As it is, the metal seal is the first backup plan if we run into problems."

However, the metal seal could be damaged during assembly.

It is also used in glass to metal seals.

It had a specially locked aluminum door and metal seal.

A filthy hand shot up towards the metal seal.

When the front doors open it sounds like the metal seal breakingon a new can of tennis balls.