| Abbreviation | Definition |
|---|---|
| SECOBARB | Secobarbital Sodium |
| SED | Serious Emotional Disturbance |
| SED | Standard Erythema Dose |
| SEDRATE | Sedimentation Rate |
| SEGS | Polymorphonuclear Neutrophil |
| SELEN | Selenium |
| SEM | Scanning Electron Microscope |
| SEM | Semen |
| SEM | Smooth Eye Movements |
| SEM | Systolic Ejection Murmur |
| SEMD | Secondary Esophageal Motility Disorder |
| sEMG | surface electromyelograph |
| SEMG | Surface ElectroMyoGraphy |
| SENS | Sensation |
| SEP | Sclerosing Encapsulating Peritonitis |
| SEP | Separate |
| SEP | Somatosensory Evoked Potential |
| SEQ | Sequela |
| SEQ | Sequence |
| SER | Smooth Endoplasmic Reticulum |