A device or substance that removes magnetic properties from an object, making it no longer magnetic.
From de- (removal) + magnetizer (something that magnetizes). The prefix de- means 'reverse' or 'remove,' combined with magnetize from Latin 'magnes' (magnet). First used in the 1800s as magnetic technology advanced.
Demagnetizers are crucial in electronics and manufacturing—when you need to 'unmagnetize' a tool or prevent magnetic interference, you run it through a demagnetizer. Interestingly, Earth's magnetic field naturally demagnetizes objects over long periods, which is why ancient compass needles gradually lose their strength.
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