de·mag·ne·tize /(ˌ)diˈmægnəˌtaɪz/
  (vt.)消磁,使退磁
  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]
  -- De*mag*net*i*za*tion, n. -- De*mag*net*i*zer n.
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  demagnetize
       v 1: 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]