Etymology
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lodestone (n.)

"magnetically polarized oxide of iron," 1510s, literally "way-stone," from lode (n.) + stone (n.). So called because it was used to make compass magnets to guide mariners. Figurative use from 1570s. Compare lodestar.

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Definitions of lodestone

lodestone (n.)
a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically;
Synonyms: loadstone
From wordnet.princeton.edu