Definition of lodestone noun from the Oxford Advanced Learner's Dictionary

 

lodestone

 noun
(also loadstone)noun
BrE BrE//ˈləʊdstəʊn//
 
; NAmE NAmE//ˈloʊdstoʊn//
 
 
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a piece of iron that acts as a magnet
See the Oxford Advanced American Dictionary entry: lodestone