A vertical passage for ducts, pipes, or wires in a building.

A series of cuts, each having a path that follows the path of the cut before it; an example is a screw thread.

1. The main body of the mold which contains the molding cavity or cavities.

2. The enclosure used to shrink-fit parts of a mold cavity in place to prevent spreading or distortion, or to enclose an assembly of two or more parts of a split-cavity block.

3. To straighten and clean threads on screws or pipes.

A rectangular metal frame in which type and plates are locked for letterpress printing.

The exposed part of a gun (artillery) in front on the trunnion band or cradle.