The Collaborative International Dictionary of English v.0.48:

Paraplegia \Par`a*ple"gi*a\, Paraplegy \Par"a*ple`gy\, n. [NL.
   paraplegia, fr. Gr. ? hemiplegia, fr. ? to strike at the
   side; para` beside + ? to strike: cf. F. parapl['e]gie.]
   (Med.)
   Palsy of the lower half of the body on both sides, caused
   usually by disease of the spinal cord. -- Par`a*pleg"ic, a.
   [1913 Webster]

WordNet (r) 3.0 (2006):

paraplegia
    n 1: paralysis of the lower half of the body (most often as a
         result of trauma)