bar magnet

noun
a bar-shaped, usually permanent, magnet.

Origin:
1820–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The magnetic trap can hold onto particles that have magnetic properties similar to those of a tiny bar magnet.
When the coil is an electromagnet, it turns to line up with the bar magnet and the motion begins.
So it is with an ordinary iron bar magnet that's near a certain critical temperature.
For a standard bar magnet, this direction is around the magnet.
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