- Sodium-calcium exchanger
- Sodium-dependent multivitamin transporter
- Sofosbuvir
- Soft diet
- Soft palate
- Soft tissue
- Soft tissue injury
- Soft tissue sarcoma
- Soft tissue sarcomas
- Softgels
- Softmax function
- Soil contamination
- Soil microorganisms
- Soil moisture
- Soil salinity
- Soil salinization
- Soil-transmitted helminth
- Soil-transmitted helminthiasis
- Sol gel
- Sol gel process
- Solanezumab
- Solanidine
- Solanum
- Solanum americanum
- Solanum nigrum
- Solanum tuberosum
- Solar erythema
- Solar plexus
- Solar radiation
- Solar spectrum
- Solar urticaria
- Solasodine
- Solasonine
- Solder
- Sole
- Soleal line
- Solenoid
- Soleus
- Soleus muscle
- Solid lipid nanoparticles
- Solid organ transplantation
- Solid phase extraction
- Solid phase microextraction
- Solid pseudopapillary tumour
- Solid state lasers
- Solid tumors
- Solid-phase microextraction
- Solid-state fermentation
- Solidarity trial
- Solifenacin
- Solitary Rectal Ulcer Syndrome
- Solitary fibrous tumor
- Solitary nucleus
- Solitary rectal ulcer syndrome
- Solitary tract
- Solitary tract nucleus
- Solithromycin
- Solubility product
- Soluble NSF attachment protein
- Soluble guanylate cyclase
- Soluble guanylyl cyclase
- Solute
- Solute carrier family
- Solutes
- Solution-focused brief therapy
- Solvent detergent plasma
- Solvent drag
- Solvent extraction
- Soma
- Soman
- Somatic
- Somatic Experiencing
- Somatic antigen
- Somatic anxiety
- Somatic cell
- Somatic cell nuclear transfer
- Somatic embryogenesis
- Somatic fusion
- Somatic gene therapy
- Somatic hypermutation
- Somatic marker hypothesis
- Somatic mutations
- Somatic nervous system
- Somatic recombination
- Somatic sensation
- Somatic sensory system
- Somatic symptom disorder
- Somatics
- Somatization
- Somatization disorder
- Somatoform disorder
- Somatomedin
- Somatomedin C
- Somatoparaphrenia
- Somatopause
- Somatosensory amplification
- Somatosensory cortex
- Somatosensory evoked potential
- Somatosensory system
- Somatostatin
- Somatostatin receptors
- Somatostatinoma
- Somatotopy
- Somatotrope
- Somatotropin
- Somatotype
- Somers' D
- Somites
- Somitogenesis
- Somitomeres
- Somnambulism
- Somniloquy
- Somnolence
- Son of sevenless
- Son preference
- Sonchus oleraceus
- Sonic hedgehog protein
- Sonicaid
- Sonication
- Sonidegib
- Sonochemistry
- Sonodynamic therapy
- Sonographers
- Sonoluminescence
- Sonophoresis
- Sonoporation
- Soot
- Sophora flavescens
- Sophora japonica
- Sophoraflavanone G
- Sophorolipids
- Sophorose
- Sopite syndrome
- Sopor
- Sorafenib
- Sorangium cellulosum
- Sorbent tube
- Sorbents
- Sorbic acid
- Sorbitan
- Sorbitan monolaurate
- Sorbitan monopalmitate
- Sorbitol
- Sorbitol dehydrogenase
- Sore throat
- Sorivudine
- Sorption
- Sorrel
- Sorrow
- Sorsby's fundus dystrophy