| SASE | Sample Sequencing | - | Medical |
| SBH | Sequencing By Hybridization | - | Medical |
| SBIR | Small Business Innovation Research | - | Medical |
| SCAN | Sequence Comparison ANalysis Program | - | Medical |
| SCE | School Of Continuing Education | - | Medical |
| SCI | Society Of Chemical Industry | - | Medical |
| SCW | Single-chromosome Workshop | - | Medical |
| SDC | San Diego Conference | - | Medical |
| SERGG | Southeast Regional Genetics Group | - | Medical |
| SHOM | Sequencing By Hybridization On Matrices | - | Medical |
| SIAM | Society For Industrial And Applied Mathematics | - | Medical |
| SIB | Society For Industrial Biology | - | Medical |
| SIM | Society For Industrial Microbiology | - | Medical |
| SIMS | Societal Institute Of The Mathematical Sciences | - | Medical |
| SIVB | Society For In Vitro Biology | - | Medical |
| SNL | Sandia National Laboratory | - | Medical |
| SNP | Single Nucleotide Polymorphism | - | Medical |
| SNRNP | Small Nuclear Ribonucleo Protein Particle | - | Medical |
| SQL | Standard Query Language | - | Medical |
| SSLP | Single-sequence Length Polymorphism | - | Medical |
| SSR | Simple Sequence Repeat | - | Medical |
| STM | Scanning Tunneling Microscope | - | Medical |
| STRP | Short Tandem Repeat Polymorphism | - | Medical |
| STS | Sequence-tagged Site | - | Medical |
| SULS | Suffolk Univ. Law School | - | Medical |
