lumbosacral

from WordNet (r) 3.0 (2006)

lumbosacral
    adj 1: of or relating to or near the small of the back and the
           back part of the pelvis between the hips

from The Collaborative International Dictionary of English v.0.48

Lumbosacral \Lum`bo*sa"cral\, n. [L. lumbus loin + E. sacral.]
   (Anat.)
   Of or pertaining to the loins and sacrum; as, the lumbosacral
   nerve, a branch of one of the lumber nerves which passes over
   the sacrum.
   [1913 Webster]