Definition: magnetite

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Source: WordNet (r) 1.7 

magnetite
     n : an oxide of iron that is strongly attracted by magnets [syn:
          magnetic iron-ore]

Source: Webster's Revised Unabridged Dictionary (1913) 

Magnetite \Mag"net*ite\, n. (Min.)
   An oxide of iron (Fe3O4) occurring in isometric crystals,
   also massive, of a black color and metallic luster. It is
   readily attracted by a magnet and sometimes possesses
   polarity, being then called loadstone. It is an important
   iron ore. Called also magnetic iron.