- SCNN1G
- SCOFF questionnaire
- SD-OCT
- SDHA
- SDHAF2
- SDHB
- SDHD
- SDS-PAGE
- SEC31A
- SEC61
- SEMA4D
- SEPN1
- SEPP1
- SERCA
- SERPINB3
- SERPINB9
- SET domain
- SET2
- SF-12
- SF-36
- SFTPB
- SFTPC
- SGK1
- SGLT2 inhibitors
- SH-SY5Y
- SH2 domain
- SHANK3
- SHOC2
- SHORT syndrome
- SHOX2
- SIADH
- SIBO
- SIDD
- SIDS
- SIGLEC5
- SIK1
- SIM1
- SIR model
- SIR-Spheres
- SIRS
- SIX3
- SK-OV-3
- SKBR3
- SKIL
- SLAMF1
- SLAP tear
- SLC12A3
- SLC19A2
- SLC19A3
- SLC1A3
- SLC22A1
- SLC22A12
- SLC22A2
- SLC22A3
- SLC22A4
- SLC22A5
- SLC23A1
- SLC24A5
- SLC25A15
- SLC25A4
- SLC25A46
- SLC26A2
- SLC26A4
- SLC2A9
- SLC45A3
- SLC6A20
- SLC9A3
- SLE
- SLI
- SLITRK1
- SLX4
- SM-102
- SMA
- SMADs
- SMART
- SMAS
- SMC protein
- SMCHD1
- SMG1
- SMN1
- SMN2
- SN-38
- SNAP-tag
- SNOMED CT
- SNP array
- SNP genotyping
- SNRNP
- SOAP notes
- SOCS1
- SOD1
- SOD2
- SOD3
- SOFA score
- SORL1
- SOS
- SOS chromotest
- SOS response
- SOX gene family
- SOX1
- SOX10
- SOX11
- SOX13
- SOX14
- SOX18
- SOX2
- SOX3
- SOX4
- SOX5
- SOX6
- SOX8
- SOX9
- SP-D
- SP7
- SPARCL1
- SPAdes
- SPECT
- SPG15
- SPRED1
- SPRY1
- SPRY4
- SQUID
- SR protein
- SRA
- SRD5A3
- SREBF2
- SRP
- SRY
- SRY gene
- SSPE
- SSRI
- SSVEP
- ST depression
- ST elevation myocardial infarction
- ST segment
- ST segment elevation
- ST segment elevation myocardial infarction
- ST14
- STAG3
- STAI
- STAR*D
- STARI
- STAT1
- STAT2
- STAT3
- STAT4
- STAT5
- STAT5A
- STAT6
- STK11
- STK4