Skip to main content - Raphidioptera (Snakeflies)
- Rappaport, Roy A.
- Raprenox (Nitrogen Scrubbing)
- Rare Species
- rare-earth elements
- Rash?d Ri??, Mu?ammad
- Rastafarianism
- Rat-Kangaroos (Potoroidae)
- Rats, Mice, and Relatives I: Voles and Lemmings (Arvicolinae)
- Rats, Mice, and Relatives II: Hamsters (Cricetinae)
- Rats, Mice, and Relatives III: Old World Rats and Mice (Murinae)
- Rats, Mice, and Relatives IV: South American Rats and Mice (Sigmodontinae)
- Rats, Mice, and Relatives V: All Other Rats, Mice, and Relatives
- Rava?
- Rayleigh, John William Strutt, Lord
- razor shell
- razor-billed auk
- real number
- real tennis
- Rebellions of 1837
