| ORD | optical rotatory dispersion; oral radiation death |
|---|---|
| OROS | oral osmotic |
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| OS | left eye [Lat. oculus sinister]; occipitosacral; occupational safety; office surgery; Omenn syndrome... |
| OSCC | oral squamous cell carcinoma |
| PLE | Pressurised liquid extraction |
|---|---|
| RP HPLC | Reversed phase high performance liquid chromatography |
| RP-HPLC | Reversed phase high performance liquid chromatographic |
| RPLC | Reversed phase liquid chromatography |
| SE-HPLC | Size exclusion high performance liquid chromatography |