| ABO | Three Main Blood Types |
|---|---|
| ABO | abortion; absent bed occupancy; American Board of Orthodontists; blood group system consisting of groups A, AB, B, and O |
| ABOHN | American Board for Occupational Health Nurses |
| ABOMS | American Board of Oral and Maxillofacial Surgery |
| ABOP | American Board of Oral Pathology |
| Abor, abor | abortion |
| Abor, abor | abortion |
| OAB | ABO blood group; old age benefits |
|---|