| UR | unconditioned reflex; upper respiratory; uridine; urinal; urology; utilization review |
|---|---|
| UCR | unconditioned response; usual, customary, and reasonable [fees] |
| UCS | unconditioned stimulus; unconscious; uterine compression syndrome |
| uncond | unconditioned |
| US | screen unsharpness ultrasonic, ultrasound; ultrasonography; unconditioned stimulus; unique sequence;... |