| EC | effective concentration; ejection click; electrochemical; electron capture; embryonal carcinoma; eme... |
|---|---|
| ECA | electrical control activity; electrocardioanalyzer; endothelial cytotoxic activity; enterobacterial ... |
| ECIS | equipment control information system |
| ECN | equipment control number |
| ECU | environmental control unit; extended care unit; extensor carpi ulnaris |