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

Derived forms: demagnetising, demagnetised, demagnetises

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

Antonym: magnetise [Brit]