| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| OBP | odorant-binding protein; ova, blood, parasites [in stool] |
| sed | sedimentation; stool [Lat. sedes] |
| SP | sacroposterior; sacrum to pubis; salivary progesterone; schizotypal personality; semi-private [room]... |
| SOB | Stool occult blood |