- 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
- Saltiness
- Salting out
- Saltpeter
- Salutogenesis
- Salvadora persica
- Salvage enzyme
- Salvage therapy
- Salves
- Salvia
- Salvia divinorum
- Salvia hispanica
- Salvia miltiorrhiza
- Salvia officinalis
- 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 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