Source : Webster's Revised Unabridged Dictionary (1913)

Humpbacked \Hump"backed`\, a.
   Having a humped back.

Source : WordNet®

humpbacked
     adj : characteristic of or suffering from kyphosis, an abnormality
           of the vertebral column [syn: {crookback}, {crookbacked},
            {humped}, {hunchback}, {hunchbacked}, {gibbous}, {kyphotic}]