| REL | rate of energy loss; recommended exposure limit; resting expiratory level |
|---|---|
| EXELFS | extended electron-loss line fine structure |
| EC | effective concentration; ejection click; electrochemical; electron capture; embryonal carcinoma; eme... |
| EPM | electron probe microanalysis; electrophoretic mobility; energy-protein malnutrition |
| LEED | low-energy electron diffraction |