| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |
|---|---|
| UCS | unconditioned stimulus; unconscious; uterine compression syndrome |
| uncond | unconditioned |
| UR | unconditioned reflex; upper respiratory; uridine; urinal; urology; utilization review |
| US | screen unsharpness ultrasonic, ultrasound; ultrasonography; unconditioned stimulus; unique sequence;... |