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

Derived forms: demagnetized, demagnetizes, demagnetizing

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

Antonym: magnetize