As a substance (without plural): Metal hammered or rolled into a thin sheet; often with the name of a metal prefixed; as, gold-foil, silver-foil, tin…

Waste metal left over after a mechanical operation has been performed, esp. that left when a coin is cut out of a blank, which goes to waste if it…

Without article: iron or steel in the form of long narrow strips or sheets, used in the manufacture of pipes, gun barrels, etc.

A mark or hole produced by punching; a piece of material cut out by a punch.

technical. Metal in a porous or sponge-like form, usually obtained by reduction without fusion.

expanded metal, expanded steel, sheet metal slit and stretched into a lattice, used for making screens and lockers, and for reinforcing concrete, etc.

A unit consisting of pieces welded together.