Source : Webster's Revised Unabridged Dictionary (1913)

Osteolysis \Os`te*ol"y*sis\, n. [NL. osteo- + Gr. ? a loosing.]
   Softening and absorption of bone. -- {Os`te*o*lyt"ic}, a.

Source : WordNet®

osteolysis
     n : lysis of bone caused by disease or infection or inadequate
         blood supply