| Abbreviation | Definition |
|---|---|
| ESR | electron spin resonance spectroscopy |
| ESR | Electronic Staff Record |
| ESR | estrogen receptor |
| ET | Endotracheal |
| ETD | Education, Training and Development |
| ETD | electron transfer dissociation |
| ETD | eustachian tube dysfunction |
| ETP | electron transport phosphorylation |
| ETP | Employer Training Pilot |
| ETP | entire treatment period |
| ETPC | Education and Training Programme in informatics management and technology for Clinicians |
| ETT | EndoTracheal Tube |
| EU | Ehrlich unit |
| EU | emergency unit |
| EU | enzyme unit |
| EU | etiology unknown |
| EU | euthyroid |
| EU | excretory urography |
| EUA | examination under anaesthesia |
| EUTCD | European Union Tissue and Cells Directives |