The Collaborative International Dictionary of English v.0.48:

Locomotor \Lo`co*mo"tor\, a. [See Locomotion.]
   Of or pertaining to movement or locomotion.
   [1913 Webster]

   Locomotor ataxia, or Progressive locomotor ataxy (Med.),
      a disease of the spinal cord characterized by peculiar
      disturbances of gait, and difficulty in coordinating
      voluntary movements.
      [1913 Webster]