Magnet

A substance which attracts iron.

A natural magnet is an ore, generally of a gray color, and consisting principally of oxides of iron and a small portion of quartz and alumina.

An artificial magnet is a bar, such as a compass needle, or a mass of iron or steel, to which magnetic force has been imparted by direct contact with a magnetic body, such as an artificial magnet in the shape of a horse-shoe, or by a dynamo.