| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
|---|---|
| BRR | Bannayan-Riley-Ruvalcaba [syndrome]; baroreceptor reflex response; breathing reserve ratio |
| CPR | cardiopulmonary reserve; cardiopulmonary resuscitation; centripetal rub; cerebral cortex perfusion r... |
| ER | efficiency ratio; epigastric region; ejection rate; electroresection; emergency room; endoplasmic re... |
| ERV | equine rhinopneumonitis virus; expiratory reserve volume |