swayback

from WordNet (r) 3.0 (2006)

swayback
    adj 1: having abnormal sagging of the spine (especially in
           horses) [syn: {dipped}, {lordotic}, {swayback},
           {swaybacked}]

from Moby Thesaurus II by Grady Ward, 1.0

30 Moby Thesaurus words for "swayback":
      bowlegs, camelback, cleft palate, clubfoot, crookback, defacement,
      deformation, deformity, disfigurement, flatfoot, freakishness,
      harelip, humpback, hunchback, knock-knee, kyphosis, lordosis,
      malconformation, malformation, misproportion, misshape,
      monstrosity, mutilation, splayfoot, talipes, teratology,
      torticollis, truncation, valgus, wryneck