WordReference Random House Learner's Dictionary of American English © 2014
lode•stone /ˈloʊdˌstoʊn/USA pronunciation  n. 
  1. [uncountable] a mineral that possesses magnetism.
  2. [countable] something that attracts like a magnet.

Collins Concise English Dictionary © HarperCollins Publishers::

lodestone, loadstone /ˈləʊdˌstəʊn/ n
  1. a rock that consists of pure or nearly pure magnetite and thus is naturally magnetic
  2. a piece of such rock, which can be used as a magnet and which was formerly used as a primitive compass
  3. a person or thing regarded as a focus of attraction
Etymology: 16th Century: literally: guiding stone

'lodestone' also found in these entries:
In the English description:

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