China 
Africa 
- Salvia sclarea
- Salvinorin
- Salvinorin A
- Sambucus ebulus
- Samp1
- Sample mean
- Sample preparation
- Sample size
- Sample standard deviation
- Sample surveys
- Sampling bias
- Sampling design
- Sampling distribution
- Sampling error
- Sampling fraction
- Sampling frame
- Sampling plan
- Sampling probability
- Sanctity of life
- Sand baths
- Sandalwood
- Sandalwood oil
- Sanders classification
- Sandhoff disease
- Sandwiches
- Sanfilippo syndrome
- Sanger sequencing
- Sangivamycin
- Sanguinaria
- Sanguinarine
- Sanguisorba officinalis
- Sanitation
- Sano shunt
- Santalum album
- Santonin
- Saphena varix
- Saphenofemoral junction
- Saphenous nerve
- Saphenous vein
- Saphenous vein graft
- Sapogenin
- Saponification
- Saporin
- Sapovirus
- Sapphire
- Saquinavir
- Sarafotoxin
- Saralasin
- Sarcina
- Sarcocystidae
- Sarcocystis
- Sarcocystis neurona
- Sarcoglycan
- Sarcoidosis
- Sarcolemma
- Sarcoma
- Sarcomatoid carcinoma
- Sarcomeres
- Sarcopenia
- Sarcoplasm
- Sarcoplasmic reticulum
- Sarcoptes scabiei
- Sarcosine
- Sargramostim
- Saridegib
- Sarilumab
- Sarin
- Sarpogrelate
- Sarsaparilla
- Sarsasapogenin
- Sartorius
- Sartorius muscle
- Sassafras
- Sassafras albidum
- Satellite DNA
- Satellite viruses
- Satiety
- Satiety value
- Sativum
- Satraplatin
- Sattler's layer
- Saturated fat
- Saturated fatty acids
- Saturation
- Saturation mutagenesis
- Satureja thymbra
- Satyriasis
- Saunas
- Saussurea
- Sauvagine
- Savant
- Savior sibling
- Saw palmetto extract
- Sawdust
- Saxagliptin
- Saxitoxin
- Sca-1
- Scabies
- Scaffold proteins
- Scaffolding
- Scala tympani
- Scala vestibuli
- Scalding
- Scalds
- Scale
- Scalene muscles
- Scaling and root planing
- Scalp
- Scalp hair
- Scalp hair loss
- Scalp-ear-nipple syndrome
- Scalpel
- Scalpels
- Scandinavian Simvastatin Survival Study
- Scanning electron microscope
- Scanning electron microscopy
- Scanning laser ophthalmoscopy
- Scanning speech
- Scaphocephaly
- Scaphoid
- Scaphoid bone
- Scaphoid fracture
- Scapholunate ligament
- Scapula
- Scapular fracture
- Scapular spine
- Scapulohumeral muscles
- Scar tissue
- Scarcity
- Scarlet fever
- Scarpa's fascia
- Scars
- Scattering amplitude
- Scavenger receptors
- Scavenger system
- Scavengers
- Scedosporiosis
- Scedosporium apiospermum
- Scent glands
- Schaffer collateral
- Schamberg disease
- Schamberg's disease
- Schatzki ring
- Scheie syndrome
- Scheimpflug principle
- Schema therapy
- Scheuermann's disease
- Schiff bases
- Schild equation
- Schiller's test