Magnet n. : 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.

Magnet n. : 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.

Example:
How does the length of a Magnet effect its strength?

Taxonomy
magnet, magnetic field, pole, magnetic moment, magnetization, bar magnet, magnetized, magnetic poles, model, wire, electrons, permanent magnet, electromagnet, ampere, south pole, substances, Magnetic domains, magnitude.

Defination from the web:
magnet as illustrated above with the iron filings. A magnet (from Greek μαγνήτις λίθος magnḗtis líthos, "Magnesian stone") is a material or object that produces a magnetic field. ...