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Rocket Propellent
- an explosive charge that propels a rocket
- an explosive charge that propels a rocket
Rock Crystal
- a clear quartz used in making electronic and optical equipment
- a clear quartz used in making electronic and optical equipment
Rhinestone
- an imitation diamond made from rock crystal or glass or paste
Rhinestones
- an imitation diamond made from rock crystal or glass or paste
Rag Paper
- paper made partly or wholly from rags
- paper made partly or wholly from rags
Reactant
- a chemical substance that is present at the start of a chemical reaction
Reactants
- a chemical substance that is present at the start of a chemical reaction
Realgar
- a rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic
Realgars
- a rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic
Red Clay
- clay whose redness results from iron oxide
- clay whose redness results from iron oxide