| NUI | number user identification |
|---|---|
| nullip | nulliparous |
| NUMA | nuclear mitotic apparatus |
| numc | number concentration |
| NURB | Neville upper reservoir buffer |
| Nut | nutrition |
| Nutcracker syndrome | the vein from the left kidney is obstructed by one of the major arteries leaving the aorta. It can cause blood to appear in the urine, and occasionally is thought to cause other symptoms. It is a rare cause of haematuria |
| NUV | near ultraviolet |