Magnet

n.
  1. The loadstone; a species of iron ore (the ferrosoferric or magnetic ore, Fe3O4) which has the property of attracting iron and some of its ores, and, when freely suspended, of pointing to the poles; -- called also natural magnet.
  2. (Physics) A bar or mass of steel or iron to which the peculiar properties of the loadstone have been imparted; -- called, in distinction from the loadstone, an artificial magnet.
    3. Field magnet (Physics & Elec.),
    a magnet used for producing and maintaining a magnetic field; -- used especially of the stationary or exciting magnet of a dynamo or electromotor in distinction from that of the moving portion or armature.