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- Serratia plymuthica
- Serratia rubidaea
- Sertoli cell
- Sertraline
- Serum
- Serum albumin
- Serum globulin
- Serum sickness
- Sesame oil
- Sesamoid bone
- Sesquiterpene
- Sestamibi scan
- Setosphaeria rostrata
- Sevelamer
- Severe
- Severe dengue
- Severe myelosuppression
- Severe preeclampsia
- Severe sepsis
- Severity
- Sevoflurane
- Sex
- Sex behavior
- Sex characteristic
- Sex chromatin
- Sex chromosome
- Sex counseling
- Sex determination
- Sex differentiation
- Sex distribution
- Sex education
- Sex offense
- Sexual abstinence
- Sexual dysfunction
- Sexual maturation
- Sexual sterilization
- Sexuality
- Sexually transmitted disease
- Sezary syndrome
- Sham intervention
- Shame
- Shampoo
- Shave biopsy
- Sheehan syndrome
- Shellfish allergy
- Shelterin
- Shewanella
- Shewanella algae
- Shewanella putrefaciens
- Shield
- Shiga toxin
- Shigella
- Shigella boydii
- Shigella dysenteriae
- Shigella flexneri
- Shigella sonnei
- Shigella vaccines
- Shingles
- Shivering
- Shock
- Shone complex
- Shope papilloma
- Short-term memory
- Short stature
- Short tandem repeat
- Shoulder
- Shoulder dislocation
- Shoulder dystocia
- Shoulder fracture
- Shoulder joint
- Shoulder pain
- Shunt
- Shunt thrombosis
- Shwachman syndrome
- Shwartzman phenomenon
- Sialadenitis
- Sialorrhea
- Sialuria
- Sibling
- Sicca syndrome
- Sickle Cell Dactylitis
- Sickle cell anemia
- Side
- Side effect
- Sideroblastic anemia
- Siderophore
- Sievert
- Sigmoid colon
- Sigmoidoscope
- Sigmoidoscopy
- Sign language
- Signal peptide
- Signal transduction
- Sildenafil citrate
- Silent mutation
- Silicate
- Silicon dioxide
- Silicone
- Silicone elastomer
- Silicosis
- Silk
- Siltuximab
- Silver
- Silver nitrate
- Silver sulfadiazine
- Silymarin
- Simeprevir
- Simethicone
- Simian virus 40
- Simple mastectomy
- Simplexvirus
- Simuliidae
- Simultanagnosia
- Simvastatin
- Sincalide
- Sindbis virus
- Sinecatechins
- Singlet oxygen
- Sinuatrial node
- Sinus
- Sinus arrhythmia
- Sinus bradycardia
- Sinus histiocytosis
- Sinus pain
- Sinus rhythm
- Sinus tachycardia
- Sinusitis
- Sinusoid
- Siplizumab
- Sipuleucel-T
- Sirenomelia
- Sirolimus
- Sisomicin
- Sitagliptin phosphate
- Site-directed mutagenesis
- Sitosterolemia
- Sitosterols
- Sitting position
- Situs Inversus
- Situs ambiguus
- Size perception
- Sizofiran
- Sjogren's syndrome
- Skeletal development
- Skeletal dysplasia
- Skeletal muscle tissue
- Skeletal myocytes
- Skeletal system
- Skeleton
- Skin
- Skin absorption
- Skin aging
- Skin carcinoma
- Skin care
- Skin erosion
- Skin examination
- Skin induration
- Skin mastocytoma
- Skin necrosis
- Skin neoplasm
- Skin nodule
- Skin papilloma
- Skin pigmentation
- Skin tag
- Skin transplantation
- Skin ulcer
- Skin vesicle
- Skin wrinkling
- Skull
- Skull fracture
- Skull neoplasm
- Slackia exigua
- Sleep
- Sleep apnea
- Sleep deprivation
- Sleep disorder
- Sleep disorders
- Sleep paralysis
- Sleep stage
- Sleep terror
- Sleeplessness
- Slow-wave sleep
- Slow respiration
- Small
- Small intestine
- Small molecule
- Smallpox
- Smallpox vaccine
- Smallpox virus
- Smegma
- Smith-Magenis syndrome
- Smokeless tobacco
- Smoking
- Smoking behavior
- Smoking cessation
- Smooth muscle
- Smooth muscle cell
- Smooth pursuit
- Smrt protein
- Sneddon syndrome
- Sneeze
- Snoring
- Soblidotin
- Social behavior
- Social disinhibition
- Social group
- Social media
- Social perception
- Social problem
- Social psychology
- Social role
- Social support
- Social work
- Socialization
- Sociobiology
- Socioeconomics
- Sociometric technique
- Sodium
- Sodium acetate
- Sodium bicarbonate
- Sodium borocaptate
- Sodium cation
- Sodium channel
- Sodium chloride
- Sodium citrate
- Sodium cyanide
- Sodium fluoride
- Sodium hypochlorite
- Sodium lactate
- Sodium salicylate
- Sodium selenite
- Sodium stibogluconate
- Sodium sulfite
- Sodium thiosulfate
- Sofosbuvir
- Soft palate
- Soft tissue
- Soleus muscle
- Solid neoplasm
- Solid organ
- Solobacterium moorei
- Solubility
- Solution
- Solvent
- Somatic mutation
- Somatization
- Somatoform disorder
- Somatomedins
- Somatosensory cortex
- Somatostatin
- Somatostatin receptor
- Somatostatinoma
- Somatotrophs
- Somatotropin
- Somite
- Somnambulism
- Somnolence
- Somnolence syndrome
- Sonication
- Soot
- Sorafenib
- Sorafenib tosylate
- Sorbitol
- Sore throat
- Sorivudine
- Sotalol
- Sotos' syndrome
- Southern blotting
- Soybean oil
- Space perception
- Sparfosic acid
- Sparganosis
- Spasm
- Spastic quadriplegia
- Spasticity
- Special education
- Specimen
- Specimen collection
- Specimen treatment
- Spectinomycin
- Spectral karyotyping
- Spectrin
- Spectrometry
- Spectrophotometer
- Spectrophotometry
- Spectrum analysis
- Speculum
- Speech
- Speech disorder
- Speech therapy
- Sperm bank
- Sperm capacitation
- Sperm cell
- Sperm granuloma
- Sperm head
- Sperm midpiece
- Sperm motility
- Sperm retrieval
- Sperm tail
- Spermatic cord
- Spermatic stasis
- Spermatid
- Spermatocele
- Spermatocyte
- Spermatogenesis
- Spermatogonium
- Spermicide
- Spermidine
- Spermine
- Spermiogenesis
- Sphenoid bone
- Sphenoid sinusitis
- Sphenoidal sinus
- Spherocyte count
- Spherocytes
- Spherocytosis
- Spheroplast
- Spherosomes
- Sphincter
- Sphingobacterium
- Sphingobacterium mizutaii
- Sphingolipid
- Sphingolipidosis
- Sphingomonadaceae
- Sphingomonas
- Sphingomonas paucimobilis
- Sphingomyelinase
- Sphingomyelins
- Sphingosine
- Sphygmomanometer
- Spider bite
- Spider venom
- Spina bifida
- Spinal artery
- Spinal block
- Spinal canal
- Spinal cord
- Spinal cord disease
- Spinal cord injury
- Spinal cord neoplasms
- Spinal disease
- Spinal fracture
- Spinal ganglion
- Spinal muscular atrophy
- Spinal neoplasms