The Collaborative International Dictionary of English v.0.48:

Oxidator \Ox"i*da`tor\, n.
   1. An oxidizer. [Obs.]
      [1913 Webster]

   2. A contrivance for causing a current of air to impinge on
      the flame of the Argand lamp; -- called also oxygenator.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Oxygenator \Ox"y*gen*a`tor\, n.
   An oxidizer.
   [1913 Webster]