| S1P | Sphingosine-1-Phosphate |
| S1P1 | Sphingosine-1-Phosphate receptor 1 |
| SA | Sebacic Acid |
| SA | Self Assembly |
| SA | Staphylococcus Aureus |
| SA | Sigma Agonist |
| SA | Saudi Arabia |
| SAA | Serum Amyloid A |
| SAAS | SoftWare As A Service |
| SAB | Scientific Advisory Board |
| SABIC | SAudi Basic Industries Corp. |
| SAC | Self Aligned Cell |
| SAD | Seasonal Affective Disorder |
| SAD | Social Anxiety Disorder |
| SADT | Self Accelerating Decomposition Temperature |
| SAE | Society of Automotive Engineers (Warrendale, PA., USA) |
| SAF | sustainable aviation fuel |
| SAGE | Serial Analysis of Gene Expression |
| SAH | Sodium Aluminum Hydride |
| SAH | S Adenosyl Homocysteine |
| SAH | Sub Arachnoid Hemorrhage |
| SAHA | Suberoyl Anilide Hydroxamic Acid (oncology) |
| SAHH | S Adenosyl Homocysteine Hydrolase |
| SAID | Steroid Anti Inflammatory Drug |
| SAIL | Stereo Array Isotope Labeling |
| SALCL | Systemic Anaplastic Large Cell Lymphoma |
| SALDE | Self Aligned Locally Deep-diffused Emitter |
| SALEN | SALicilaldehyde Ethylene DiamiNe |
| SAM | Self Assembled Monolayer |
| SAM | S Adenosyl Methionine |
| SaMD | Software as a Medical Device |
| SAME | S-Adenosyl MEthionine |
| SAN | Styrene Acrylo Nitrile copolymer |
| SAN | Storage Area Networks |
| SANE | Solvent Assisted Nanoscale Embossing |
| SAP | Super Absorbent Polymer |
| SAP | Serum Amyloid Protein |
| SAPL | Surface Active Phospho Lipid |
| SAPO | Silica Alumina PO4 |
| SAPPA | Speckling Anti Pan Polymorphonuclear Ab |
| SAR | Staphylococcus Aureus Regulated protein |
| SAR | Structure Activity Relationship |
| SAR Allerg | Seasonal Allergic Rhinitis |
| SARM | Selective Androgen Receptor Modulators |
| SARS | Severe Acute Respiratory Syndrome |
| SAS | Self-Assembled chromophore Superlattice |
| SAW | Surface Acoustic Wave |
| SB | Solvent Based |
| SBC | Styrene Block Copolymers |
| SBDD | Structure Based Drug Design |
| SBE | Starch Branching Enzyme |
| SBIR | Small Business Innovation Research |
| SBLA | Supplemental Biologics License Application (BioPharma/FDA) |
| SBM | Styrene Butadiene MMA |
| SBM Gastro | spontaneous bowel movement |
| SBPC | Sociedade Brasileira para Progresso da Ciencia (Brazil) |
| SBR | Styrene Butadiene Rubber |
| SBRT | Stereotactic Body RT |
| SBS | Styrene Butadiene Styrene (triblock copolymer) |
| SBS | Short Bowel Syndrome |
| SBSE | Stir Bar Sorptive Extraction (GC/MS analytics) |
| SC Electro | Semi Conductor |
| SC Eye | Stratum Corneum |
| SC Injecti | Sub Cutaneous |
| SCA | Spino Cerebellar Ataxia |
| SCADS | Statistical Computationally Assisted Design Strategy |
| SCBDI | Short Chain Branching Distribution Index |
| SCD | sickle cell disease |
| SCF | Stem Cell Factor |
| SCF | Stem Cell growth Factor |
| SCFV | Single Chain Fragment Variable |
| SCI | Spinal Cord Injury |
| SCID | Severe Combined Immuno Deficiency |
| SCII | Sub Cutaneous Insulin Inj. |
| SCLC | Small Cell Lung Cancer |
| scMRD | single cell MRD |
| SCN | Severe Chronic Neutropenia |
| SCNT | Somatic Cell Nuclear Transfer |
| SCORR | Supercritical CO2 Resist Remover |
| SCR | Selective Catalytic Reduction (NOx redn by urea) |
| SCS | spinal cord stimulation |
| SCT | Stem Cell Transplant |
| SD | Software Defined |
| SD | Single Domain |
| SDA | Structure Directing Agent |
| SDA | Steari Donic Acid |
| SDC | Samaria Doped Ceria |
| SDF | Silver Diamine Fluoride |
| SDI | Sorbitol Dehydrogenase Inhibitors |
| SDMS | Scientific Data Management System |
| SDR | Software Defined Radios |
| SDS | Sodium Dodecyl Sulfate |
| SDS | Solid Delivery System |
| SDS-PAGE | Sodium Dodecyl Sulfate Poly Acrylamide Gel Electrophoresis |
| SE | Staphylococcal Enterotoxin |
| SE | SwEden |
| SEA | Staphylococcal Enterotoxin A |
| SEA | Sugar Engineered Antibody |
| SEBS | Styrene Ethylene Butene Styrene copolymer |
| SEC | Size Exclusion Chromatography |
| SEC | Soft Elastic Capsules |
| SEC | Securities & Exchange Commission |
| SECM | Scanning Electro Chemical Microscopy |
| SEDA | Standby Equity Distribution Agreement |
| sEEG | stereo EEG |
| SEGA | Sub Ependymal Giant cell Astrocytoma |
| SEGRA | SElective Glucocorticoid Receptor Agonist |
| SELDI-TOF | Surface Enhanced Laser Desorption/Ionization Time-Of-Flight |
| SEM | 2-Sulfo Ethyl Methacrylate |
| SEMI | Semiconductor Equipment & Materials Intl. |
| SEOF | Self Emulsifying Oily Formulation |
| SEP | Synthetic Erythropoiesis Protein |
| SEPN | SEPARATION |
| SEPS | Styrene Ethylene Propene Styrene terpolymer elastomer |
| SER | Sequestration Enabling Reagents (CombiChem) |
| SERA | Selective Endothelin-A Receptor Antagonists |
| SERD | Selective Estrogen Receptor Downregulator |
| SERM | Selective Estrogen Receptor Modulator |
| SERS | Surface Enhanced Raman Spectroscopy |
| SES | Solid Emulsion System |
| SET | Single Electron Transistor |
| SET | Staphylococcus aureus Entero Toxins |
| SFA | Superficial Femoral Artery |
| SFASE | Sucrose Fatty Acid Sulphate Ester |
| SFC | Supercritical Fluid Chromatography |
| SFDI | Spatial Frequency Domain Imaging |
| SFI | Solid Fat Index |
| SFR | Stable Free Radical |
| SFVE | Sulfonyl Fluoride Vinyl Ether |
| SGA | Small for Gestational Age |
| SGLT | Sodium GLucose co-Transporter |
| SGRI | Selective GABA Reuptake Inhibitor |
| SGRT | surface-guided radiation therapy |
| SH | Src Homology (protein) |
| SHIV | Simian Human Immunodeficiency Viruses |
| SHM | Somatic Hyper Mutation |
| SHOP | Shell Higher Olefin Process |
| SHP | Src Homology Phosphatase |
| SHPT | Secondary Hyper Para Thyroidism |
| SHR | ScapuloHumeral Rhythm |
| SHS | Self-propagating High-temperature Synthesis |
| SI | Slovenia |
| SI Spine | SacroIliitis and SacroIliac |
| SIAB | Succinimidyl-(4-Iodoacetyl) Amino Benzoate |
| SICM | Scanning Ion Conductance Microscopy |
| SIDS | Sudden Infant Death Syndrome |
| SIF | Synthesis Inhibiting Factor (DNA) |
| SIF | Sacral Insufficiency Fracture |
| SIMS | Single Insertion Multiple Sample |
| SINM | Statin Induced Neuro Myopathy |
| SIP | Structural Insulated Panel |
| SIPA | Shear Stress Induced Platelet Aggregation |
| SIPA | 5-Sulfo Iso Phthalic Acid |
| SIR | Signal Regulatory Protein |
| SIRNA | Small Interference RNA |
| SIRT | Selective Internal Radiation Therapy |
| SIS | Styrene Isoprene Styrene (triblock copolymer) |
| SIS | Structural Insulating Sheathing |
| SIV | Simian Immunodeficiency Virus |
| SjS | Sjögren Syndrome |
| SK | SlovaKia |
| SLA | Stereo Lithography Apparatus |
| SLE | Systemic Lupus Erythematosis |
| SLI | Starting Lighting & Ignition |
| SLR | Sustained Limus Release |
| SLS | Sodium Lauryl Sulfate |
| SLT | Shiga Like Toxin |
| SLT Eye | selective laser trabeculoplasty |
| SM | Samarium |
| SM | Small Molecule |
| SMA | Styrene Maleic Anhydride Copolymer |
| SMA | Spinal Muscular Atrophy |
| SMAC | Second Mitochondria-derived Activator of Caspases |
| SMB | Simulated Moving Bed (LC) |
| SMBG | Self Monitoring Blood Glucose |
| SMC | Smooth Muscle Cell |
| SMC | Sheet Molded Compound |
| SMC | Synthetic Micro Chromosome |
| SMC | Scottish Medicines Consortium |
| SMCC | Silicified Micro Crystalline Cellulose |
| SMD | Stargardt s Macular Dystrophy |
| SME | Sub Micron Emulsion |
| SMFS | Single Molecule Force Spectroscopy |
| SMI | Small Molecule Inhibitor |
| SMIP | Small Modular Immuno Pharmaceutical |
| SMM | Single Molecule Magnet |
| SMN | Survival Motor Neuron |
| SMSLS | Simultaneous Multiple Sample Light Scattering |
| SMT | surface-mount-technology |
| SNAC | Sodium N-(8-(2-hydroxybenzoyl)Amino)Caprylate |
| SNAP | Significant New Alternatives Policy (EPA) |
| SNCR | Selective Non Catalytic Reduction (NOx redn by urea) |
| SNDA | Supplemental New Drug Application |
| SNECMA | Societé Nationale d'Etude et de Construction de Moteurs d'Aviation (France) |
| SNM | Sacral NeuroModulation |
| SNOBS | Sodium Nonanoyl Oxy Benzene Sulphonate |
| SNP | Single Nucleotide Polymorphism |
| SNRI | Serotonin and Norepinephrine Reuptake Inhibitor |
| SNRI | Selective Norepinephrine Reuptake Inhibitor |
| SO | Septal Occluder |
| SOA | Service Oriented Architecture |
| SOC Ca | Store Operated Calcium |
| SOC Chip | Server On Chip |
| SOCIAL | Speed Open Cooperation Individual Alignment Leadership |
| SOD | Super Oxide Dismutase |
| SOD | Spin On Dielectric |
| SOE | Spiro Ortho Ester |
| SOFC | Solid Oxide Fuel Cell |
| SOFI | Stochastic Optical Fluctuation Imaging |
| SOG | Spin On Glass |
| SOLN | Solution |
| SOLY | Solubility |
| SOR | Super Oxide Reductase |
| SORS | Spatially Offset Raman Spectroscopy |
| SOS | Stearate-Oleate-Stearate |
| SOS | sinusoidal obstruction syndrome |
| SPA | Special Protocol Assessment (FDA) |
| SPAF | Stroke Prevn. in patients with Atrial Fibrillation |
| SPAN | Sulfonated Poly ANiline |
| SPC | Supplementary Protection Certificates (Pharma Industry) |
| SPD | Suspended Particle Device |
| SPE | Streptococcal Pyrogenic Exotoxin |
| SPE | Solid Phase Extraction |
| SPECT | Single Photon Emission Computed Tomography |
| SPF | Sunscreen Protection Factor |
| SPF | Sun Protection Factor |
| SPF | Spray Polyurethane Foam |
| SPI | Society of the Plastics Industry |
| SPION | super-paramagnetic iron-oxide nanoparticle |
| SPLA | Secretory Phospho Lipase A |
| SPME | Solid-Phase Micro Extraction |
| SpO2 | blood Oxygen Saturation |
| SPPS | Solid Phase Peptide Synthesis |
| SPRI | Schering-Plough Research Institute |
| SPS | Syndiotactic Poly Styrene |
| SPS | Sulfonated Poly Styrene |
| SPS | Spark Plasma Sintering |
| SPT | Sensory Perception Technologies |
| SPU | Segmented Poly Urethane |
| SR | Spray Rating (textiles) |
| SR | Sustained Release |
| SRBA | Selective Relaxant Binding Agent |
| SRBC | Sheep Red Blood Cell |
| SRCAP | SNF2 Related CBP Activator Protein |
| SRE | Sterol Response Element |
| SRE | Skeletal-Related Events |
| SRP | Soil Release Polymer |
| SRP | Self-Reinforced Polyphenylene |
| SRRC | Southern Regional Research Center (USDA) |
| SRS | Sulphate Removal System |
| SRS | Stimulated Raman Scattering |
| SRS | Stereotactic Radio Surgery |
| SRT | Sulfur Removal Technologies |
| SRV | Safety Release Valve |
| SSAO | Semicarbazide Sensitive Amine Oxidase |
| SSB | Single Stranded DNA Binding (protein) |
| SSD | Site Specific Dosage |
| SSF | Simultaneous Saccharification & Fermentation |
| SSI | surgical site infection |
| SSL | Steel Strip Laminate |
| SSP | Solid State Process (PolyEster) |
| SSP | Solid State Polymn. (PolyEster) |
| SSR | Site Specific Recombinase |
| SSRI | Selective Serotonin Reuptake Inhibitor |
| SSTI | Skin and Soft Tissue Infections |
| SSTR | Somato Statin Type Receptor |
| ST | Stent Thrombosis |
| ST | Spin Transition |
| ST | Supraventricular Tachycardia |
| STA | Shuttle Tile Ablator |
| STABN | Stabilization |
| STABR | Stabilizer |
| STAC | Sir Tuin Activating Compounds |
| STB | Sodium Tertiary Butoxide (Base) |
| STBBIs | Sexually Transmitted Blood-Borne Infections |
| STD | Sexually Transmitted Diseases |
| STDP | Selective Toluene Dis Proportionation (p-xylene mfg) |
| STEMI | ST-segment Elevation Myocardial Infarction |
| STH | Somato Tropin Hormone |
| STI | Shallow Trench Isolation (Electronics) |
| STI Infect | Sexual Transmitted Infection |
| STM | Scanning Tunneling Microscopy |
| STPP | Sodium Tri Poly Phosphate |
| STR | Short Tandem Repeats |
| STR | Skeletal Targeted Radiotherapy |
| STS | Secondary Traumatic Stress |
| STS Onco. | Soft Tissue Sarcoma |
| STT | Spinning Tube-in-Tube (chemical reactor) |
| SU | Sulfamoyl Urea (herbicides) |
| SU | Sulfonyl Ureas |
| SuFEx | Sulfur Fluoride Exchange |
| SUI | Stress Urinary InContinence |
| SUID | Sudden Unexpected Infant Death |
| SUPAR | Soluble Urokinase Plasminogen Activator Receptor |
| SUR | Sulfonyl Urea Receptor (obesity, diabetes) |
| SURH | Sulfonyl Urea Receptor Human |
| SURI | Selective Uric acid Reabsorption Inhibitor |
| SUV | Small Unilamellar Vesicle (liposome) |
| SUV | Sport Utility Vehicle |
| SV | Smaller Vessels |
| SV Stroke | Stroke Volume |
| SVAS | Supravalvular Aortic Stenosis |
| SVP | Sealed Vasectomy Procedure |
| SVR | Sustained Viral Response |
| SVR Vascul | Systemic Vascular Resistance |
| SVV | Stroke Volume Variation |
| SWD | Shift Work Disorder |
| SWIR | Short Wave IR |
| SWNT | Single Wall Nano Tube |
| SWSD | Shift Work Sleep Disorder |
| SYK | Spleen tYrosine Kinase |
| SYR | SYringe infusion pump |