Etymology
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magnetite (n.)

magnetic or magnetizable iron ore, 1840, from German magnetit; see magnet + -ite (2).

updated on October 30, 2018

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Definitions of magnetite from WordNet

magnetite (n.)
an oxide of iron that is strongly attracted by magnets;
Synonyms: magnetic iron-ore
From wordnet.princeton.edu, not affiliated with etymonline.