| Abbreviations | Meaning |
 | OAP | Precocious Osteoarthrosis |
| OAF | Off-axis Factor; Off-axis Ratio [radiotherapy]; Open Air Factor; Osteoclast Activating Factor |
| OAP | Osteoarthropathy |
| DO | Doctor Of Osteopathy |
| OCN | Oculomotor Nucleus; Oncology Certified Nurse; Osteocalcin |
| BB | Bolton Point; Both Bones |
| STOP IT | Sites Testing Osteoporosis Prevention Intervention Treatment |
| A>B | Air Greater Than Bone (conduction) |
| FHD | Familial Histiocytic Dermatoarthritis; Family History Of Diabetes; Femoral Head Diameter |
| ODD | Oculodentodigital [dysplasia]; Oppositional Defiant Disorder; Osteodental Dysplasia |
| OM&S | Osteopathic Medicine And Surgery |
| BAHAŽ | Bone-anchored Hearing Aid |
| DTBM | Demineralized Trabecular Bone Matrix |
| AO | Atelosteogenesis |
| ARU | Arthritis Rehabilitation Unit |
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