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The Collaborative International Dictionary
Demagnetize

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.

Douglas Harper's Etymology Dictionary
demagnetize

1839; see de- + magnetize.\nRelated: Demagnetized; demagnetizing.

Wiktionary
demagnetize

vb. 1 To make something nonmagnetic by removing its magnetic properties. 2 To erase the contents of a magnetic storage device.

WordNet
demagnetize
  1. v. erase (a magnetic storage device) [syn: demagnetise]

  2. make nonmagnetic; take away the magnetic properties (of); "demagnetize the iron shavings"; "they degaussed the ship" [syn: demagnetise, degauss] [ant: magnetize, magnetize]

Usage examples of "demagnetize".

With a flick at the switch he turned off its current and momentarily demagnetized it.

He demagnetized the cable again, and flicked it downward, rising six inches into the air as he did so.

They demagnetized their boots, and from spools on their belts, small motors pulled them to the hatch, where they disappeared into the airlock.