| Abbreviations | Meaning |
 | OM | Osteomalacia |
| YA | Yersinia Arthritis |
| RAT | Repeat Action Tablet; Rheumatoid Arthritis Test; Right Anterior Trigone |
| RA | Rheumatoid Arthritis |
| ABM | Abamectin; Adjusted Body Mass; Alveolar Basement Membrane; Autologous Bone Marrow |
| ABCDES | Ankylosis, Bone Osteoporosis, Cartilage Destruction, Deformity Of Joints, Erosions, Swelling Of Soft Tissues [x-ray Features Of Septic Arthritis] |
| BIG | Bone Injection Gun |
| NOF | National Osteopathic Foundation; National Osteoporosis Foundation |
| BMP | Bitmap; Bone Morphogenetic Protein |
| ABMI | Autologous Bone Marrow Infusion |
| OPS | Operations; Optical Position Sensor; Osteoporosis-pseudolipoma Syndrome; Outpatient Service; Outpatient Surgery |
| RAS | Rheumatoid Arthritis Serum |
| ON | Occipitonuchal; Office Nurse; Olfactory Nucleus; Onlay; Optic Nerve; Orthopedic Nurse; Osteonecrosis; Osteonectin; Overnight |
| OIC | Organized Indigenous Caregiving; Osteogenesis Imperfecta Congenita |
| OAP | Osteoarthropathy |
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