The Collaborative International Dictionary of English v.0.48:

Pulmotor \Pul"mo`tor\, n. [L. pulmo lung + E. motor.]
   An apparatus for producing artificial respiration by pumping
   oxygen or air or a mixture of the two into and out of the
   lungs, as of a person who has been asphyxiated by drowning,
   breathing poisonous gases, or the like, or of one who has
   been stunned by an electrical shock.
   [Webster 1913 Suppl.]