The Collaborative International Dictionary of English v.0.48:

Etherize \E"ther*ize\, v. t. [imp. & p. p. Etherized; p. pr. &
   vb. n. Etherizing.] [Cf. F. ['e]th['e]riser.]
   1. To convert into ether.
      [1913 Webster]

   2. To render insensible by means of ether, as by inhalation;
      as, to etherize a patient.
      [1913 Webster]