| PEM | pediatric emergency medicine; peritoneal exudate macrophage; polymorphic epithelial mucin; prescript... |
|---|---|
| RE | radium emanation; readmission; rectal examination; reference emitter; reflux esophagitis; regional e... |
| REE | rapid extinction effect; rare earth element; resting energy expenditure |
| REL | rate of energy loss; recommended exposure limit; resting expiratory level |
| RHEED | reflection high-energy electron diffraction |