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English definition of “lodestone”

lodestone

noun [C or U]     /ˈləʊd.stəʊn/ US  /ˈloʊd.stoʊn/
(a piece of) rock that contains a lot of iron and can therefore be used as a magnet (= an object that pulls metal objects towards it)Types of rockPrecious and semi-precious stones
(Definition of lodestone noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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