| Abbreviation | Definition |
|---|---|
| BR | bronchial reactivity |
| BR | bronchial response |
| BR | bronchus |
| BR | budget requirement |
| BR | bumetanide-resistant |
| BRAC | basic rest-activity cycle |
| BRAC | breath alcohol content |
| BRAG | Blue, Red, Amber, Green |
| BRAINS | Bayer Randomised Acute Ischemia Neuroprotectant Study |
| BRAINS | Biochemical Research & Information Study |
| BRAP | brachial arterial pressure |
| BRAP | burst of rapid atrial pacing |
| BRCP | breast cancer resistance protein |
| BRCS | British Red Cross Society |
| BRCT | Brain Resuscitation Clinical Trial |
| BRDPI | Biomedical Research & Development Price Index |
| BREATHE | Base Rest Rate Elevation for Sleep Apnea Therapy |
| BREATHE | Bosentan Randomised Trial of Endothelin Antagonist Therapy |
| BREATHE | Bosentan Randomised???Trial of Endothelin Antagonist Therapy |
| BREATHE | Bosentan RandomisedTrial of Endothelin Antagonist Therapy |