magnetite Meaning, Definition & Usage

  1. noun an oxide of iron that is strongly attracted by magnets
    magnetic iron-ore.

WordNet

Mag"net*ite noun
Definitions
  1. (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.

Webster 1913