- PSA
- Continental rift
- Passeriformes
- Regenerative braking
- Anhydrobiosis
- Submersion
- Gravitational constant
- Wavelength
- Bufotenine
- Algal film
- U
- Chorea
- Neoadjuvant
- Rover
- Third law of thermodynamics
- Urothelium
- Spyware
- Herbivore
- Mars Sample Return
- Ultrabasic
- Internet Storm Center
- Elementary particle physics
- Class III antiarrhythmics
- Macromolecule
- Thrombocytopenia
- Ester bond
- Texture
- Anechoic chamber
- Teratogenesis
- Mouse