| UR | unconditioned reflex; upper respiratory; uridine; urinal; urology; utilization review |
|---|---|
| Ur | urea; urine, urinary |
| URA, Ura | uracil |
| URAC | Utilization Review Accreditation Commission |
| URC | upper rib cage; utilization review committee |
| URD | unspecified respiratory disease; upper respiratory disease |
| Urd | uridine |
| ureth | urethra |
| URF | unidentified reading frame; uterine relaxing factor |
| URG | urogastrone |