Dictionaries, Thesauruses, Pictures, and Press Releases
- Ray, Prafulla Chandra
- ray-finned fish
- Rayet, Georges Antoine Pons
- Rayleigh wave
- Rayleigh, Lord
- Raymond of Marseilles
- Raymond, Percy Edward
- rays
- Razi Abu Bakr Muhammad Ibn Zakariyya' Al-
- Razmadze, Andrei Mikhailovich
- razor-strop fungus
- razorfish
- RDP
- reabsorption
- reactant
- reaction centre
- reaction wood
- reactivation surface
- reading mistake
- reading mistake