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Ruthenia
- a rare polyvalent metallic element of the platinum group; it is found associated with platinum
Ruthenium
- a rare polyvalent metallic element of the platinum group; it is found associated with platinum
Ru
- a rare polyvalent metallic element of the platinum group; it is found associated with platinum
Rutherfordia
- a radioactive transuranic element which has been synthesized
Rutherfordium
- a radioactive transuranic element which has been synthesized
Radiothoria
- radioactive isotope of thorium with mass number 228
Radiothorium
- radioactive isotope of thorium with mass number 228
Rock Salt
- naturally occurring crystalline sodium chloride
- naturally occurring crystalline sodium chloride
Rocket Fuel
- an explosive charge that propels a rocket
- an explosive charge that propels a rocket
Rocket Propellant
- an explosive charge that propels a rocket
- an explosive charge that propels a rocket