| Abbreviation | Definition |
|---|---|
| EOSL | Electro-Optical Systems Laboratory |
| EP | end product |
| EP | Evoked Potential |
| EPA | eicosapentaenoic acid |
| EPA | Evaluation Potency and Activity |
| EPB | External Proton Beam |
| EPD | Enzyme Potentiated Desensitization |
| EPD | Expected Progeny Deviation |
| EPIINFO | Epidemiological Information |
| EPIR | Experimental Peptide Identification Repository |
| EPO | ErythroPOietin |
| EPS | ElectroPhysiologic study |
| Eq | equine |
| ER | Estrogen receptor |
| ERA | Endothelin Receptor Agonist |
| ERC | Endometriosis Research Center |
| ERCP | Endoscopic Retrograde Cholangio Pancreatography |
| ERDL | Engineer Research and Development Laboratory |
| ERDL | Engineer Research Development Laboratories |
| ERIC | Enterobacterial Repetitive Intergenic Consensus |