demagnetizer
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Demagnetize \De*mag"net*ize\, v. t.
1. To deprive of magnetic properties; to render nonmagnetic.
See {Magnetize}.

If the bar be rapidly magnetized and demagnetized.
--Am. Cyc.

2. To free from mesmeric influence; to demesmerize. [archaic]
[1913 Webster +PJC] -- {De*mag`net*i*za"tion}, n. --
{De*mag"net*i`zer}, n.