| BRR | Bannayan-Riley-Ruvalcaba [syndrome]; baroreceptor reflex response; breathing reserve ratio |
|---|---|
| KA | alkaline phosphatase; kainic acid; keratoacanthoma; keto acid; ketoacidosis; King-Armstrong [unit] |
| KAU | King-Armstrong unit |
| RD | radial deviation; radiology department; rate difference; Raynaud disease; reaction of degeneration; ... |