From The Collaborative International Dictionary of English v.0.44 [gcide]:
Magnetite \Mag"net*ite\, noun (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}.
From WordNet (r) 2.0 [wn]:
noun
1: an oxide of iron that is strongly attracted by magnets [syn: {magnetic iron-ore}]
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