| OB | obese [mouse]; obese, obesity; objective benefit; obliterative bronchiolitis; obstetrics, obstetrici... |
|---|---|
| OBG, ObG | obstetrics and gynecology, obstetrician-gynecologist |
| OB-GYN, | ob-gyn obstetrics and gynecology, obstetrician-gynecologist |
| Obs | observation, observed; obstetrics, obstetrician |
| Obst | obstetrics, obstetrician |