Source : Webster's Revised Unabridged Dictionary (1913)

Immaterialize \Im`ma*te"ri*al*ize\, v. t. [Cf. F.
   immat['e]rialiser.]
   To render immaterial or incorporeal.

         Immateralized spirits.                   --Glanvill.

Source : WordNet®

immaterialize
     v : render immaterial or incorporeal [syn: {immaterialise}, {unsubstantialize},
          {unsubstantialise}]