| Abbreviation | Definition |
|---|---|
| SN | sodium nitrate |
| SN | solitary nucleus |
| SN | spinal nerve |
| SN | splanchnic nerve |
| SN | spontaneous nystagmus |
| SN | staff nurse |
| SN | stromal nodule |
| SN | student nurse |
| SN | substantia nigra |
| SN | supernatant |
| SN | supernumerary |
| SN | suprasternal notch |
| SN | sural nerve |
| SNAFU | situation normal, all fouled (!) up |
| SNMAC | Standing Nursing and Midwifery Advisory Committee |
| SNMT | systematic nutritional muscle testing |
| SNOMED | Systematised Nomenclature of Medicine |
| SNP | School Nurse Practitioner |
| SNP | Scottish Nationalist Party (!) |
| SNP | single nucleotide polymorphism (!) |