| RMR | relative maximum respone; resting metabolic rate; right medial rectus [muscle] |
|---|---|
| RSR | regular sinus rhythm; relative survival rate; right superior rectus [muscle] |
| EC | effective concentration; ejection click; electrochemical; electron capture; embryonal carcinoma; eme... |
| ECP | ectrodactyly-cleft palate [syndrome]; effector cell precursor; endocardial potential; eosinophil cat... |
| ER | efficiency ratio; epigastric region; ejection rate; electroresection; emergency room; endoplasmic re... |