os·te·oc·la·sis 
(ŏs′tē-ŏklə-sĭs)
(ŏs′tē-ŏklə-sĭs)n. pl. os·te·oc·la·ses (-sēz′)
1. The process of dissolution and resorption of bony tissue.
2. Surgical fracture of a bone, performed to correct a deformity.
[OSTEO- + Greek klasis, breakage (from klān, to break).]