- Solar eclipse of 11 August 1999
- Angiotensin 2 antagonists
- Sorosilicates
- Solar Orbiter
- Surgery
- Variability in heart rate
- Uranus
- Thrombocytopenia
- Kelvin's postulate
- Alcohol
- Endometriosis
- Primitive ocean
- Secondary energy
- Powder acceleration stage
- Condensation boiler
- Solar flare
- Epoxide
- Barnacle
- Vulva
- Luminol
- Spectral classification
- Syphilis
- Button cell
- Douglas fir
- Scoliosis
- Cellulose
- Apparent coordinates
- Excoriation
- Endocarditis
- Bubonic plague