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Verb: demagnetize  dee'mag-nu,tIz
  1. (physics) make nonmagnetic; take away the magnetic properties (of)
    "demagnetize the iron shavings";
    - demagnetise [Brit], degauss
     
  2. Erase (a magnetic storage device)
    "They demagnetized the old hard drives before disposing of them";
    - demagnetise [Brit]

Derived forms: demagnetized, demagnetizes, demagnetizing

Type of: alter, change, delete, erase, modify, scrub, wipe