China 
Africa 
- STR analysis
- STRO-1
- SULT2A1
- SUV
- SV40
- SYBR Gold
- SYK
- SaPI
- SaRNA
- Saber shin
- Sabin-Feldman dye test
- Sabinene
- Saccades
- Saccadic eye movement
- Saccharic acid
- Saccharides
- Saccharification
- Saccharin
- Saccharomyces
- Saccharomyces boulardii
- Saccharomyces cerevisiae
- Saccharomycetales
- Saccharomycetes
- Saccular aneurysm
- Saccule
- Sacituzumab govitecan
- Saclofen
- Sacral agenesis
- Sacral anterior root stimulator
- Sacral fracture
- Sacral ganglia
- Sacral nerve stimulation
- Sacral plexus
- Sacral spinal cord
- Sacral splanchnic nerves
- Sacral vertebra
- Sacrococcygeal teratoma
- Sacrocolpopexy
- Sacrohysteropexy
- Sacroiliac joint
- Sacroiliac joint dysfunction
- Sacroiliitis
- Sacrospinous ligament
- Sacrotuberous ligament
- Sacrum
- Sacsin
- Sacubitril
- Sacubitrilat
- Sad Persons Scale
- Saddle anesthesia
- Saddle joint
- Saddle nose
- Sadness
- Saethre-Chotzen syndrome
- Safety
- Safety behaviors
- Safety case
- Safety culture
- Safety data sheet
- Safety engineering
- Safety factors
- Safety lamp
- Safety management system
- Safety pharmacology
- Safflower
- Safflower oil
- Saffron
- Safinamide
- Safranal
- Safranin
- Safrole
- Sage oil
- Sagittal
- Sagittal abdominal diameter
- Sagittal plane
- Sagittal sinus thrombosis
- Sagittal suture
- Sago
- Saint Louis encephalitis
- Saint's triad
- Sakuranetin
- Salbutamol
- Salep
- Salicin
- Salicyl alcohol
- Salicylamide
- Salicylanilide
- Salicylate
- Salicylate poisoning
- Salicylhydroxamic acid
- Salicylic acid
- Salicyluric acid
- Salidroside
- Salience
- Salience network
- Salination
- Saline
- Saline flush
- Salinispora
- Salinispora tropica
- Salinity
- Salinization
- Salinometer
- Salinomycin
- Salinosporamide
- Salinosporamide A
- Saliva
- Saliva substitute
- Salivary duct carcinoma
- Salivary gland
- Salivary gland diseases
- Salivary microbiome
- Salivation
- Salivirus
- Salix
- Salix alba
- Salkowski's test
- Salmeterol
- Salmonella
- Salmonella Enteritidis
- Salmonella Typhi
- Salmonella Typhimurium
- Salmonella bongori
- Salmonella enterica
- Salmonellosis
- Salpingectomy
- Salpingitis
- Salpingitis isthmica nodosa
- Salpingo-oophorectomy
- Salpingopharyngeus
- Salpingostomy
- Salsalate
- Salt substitute
- Salt-and-pepper chromatin
- Saltatory conduction
- Salted fish
- Salter-Harris fractures
- Saltiness
- Salting out
- Saltpeter
- Salutogenesis
- Salvadora persica
- Salvage enzyme
- Salvage therapy
- Salves
- Salvia
- Salvia divinorum
- Salvia hispanica
- Salvia miltiorrhiza
- Salvia officinalis