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lodestar
A sailor's name for Polaris, or the Pole Star. The origin of the name presumably comes from the same old English source as lodeman and lodestone, to give a meaning as ‘guiding star’.

lodestone Quick reference
The Oxford Companion to Ships and the Sea (2 ed.)
the seaman's name for magnetic oxide of iron. It is said that the ancient Chinese discovered that, when freely suspended, it would point to the north, and therefore used it to form the ...
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lodestone Quick reference
The Oxford Dictionary of Phrase and Fable (2 ed.)
a piece of magnetite or other naturally magnetized mineral, able to be used as a magnet. Recorded from the early 16th century, the word means literally ‘way-stone’, from the use of the ...
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magnetic compass
An instrument containing a freely suspended magnetic element that displays the direction of the horizontal component of the earth's magnetic field at the point of observation.
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