A device or substance that removes or reduces magnetic properties; British English spelling.
From 'demagnetise' (verb) + '-er' (agent suffix creating nouns for devices or persons). British English uses '-iser' while American English uses '-izer.'
Demagnetisers are essential in electronics—degaussing coils in old CRT monitors were demagnetisers that protected screens from stray magnetic fields. The word sounds technical, but the device is nearly ancient.
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