The Collaborative International Dictionary of English v.0.48:

Pelvic \Pel"vic\, a.
   Of, pertaining to, or in the region of, the pelvis; as,
   pelvic cellulitis.
   [1913 Webster]

   Pelvic arch, or Pelvic girdle (Anat.), the two or more
      bony or cartilaginous pieces of the vertebrate skeleton to
      which the hind limbs are articulated. When fully ossified,
      the arch usually consists of three principal bones on each
      side, the ilium, ischium, and pubis, which are often
      closely united in the adult, forming the innominate bone.
      See Innominate bone, under Innominate.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pelvic arch
    n 1: the structure of the vertebrate skeleton supporting the
         lower limbs in humans and the hind limbs or corresponding
         parts in other vertebrates [syn: pelvis, pelvic girdle,
         pelvic arch, hip]