| Abbreviation | Definition |
|---|---|
| RD | Random Dilution |
| RDB | Ring and Double Bond |
| RDC | Residual Dipolar Coupling |
| RDGE | resorcinol diglycidyl ether |
| RDH | Rapid Displacement Heating |
| RDRP | Ribonucleic acid dependant Ribonucleic acid polymerase |
| RdRP | RNA-dependent RNA polymerase |
| RDT | Recombinant DNA (DeoxyriboNucleic Acid) Technology |
| RDX | Cyclotrimethylenetrinitramine |
| RE | Rare Earth |
| RE | Rhenium |
| RECL | Rajasthan Explosives and Chemical Limited |
| RED | Renewable Emulsified Diesel |
| Redox | Reduction & Oxidation |
| REE | Rare Earth Element |
| REM | Relative Electrophoresis Mobility |
| REQ | Require |
| RER | Radiation Effects Reactor |
| RER | Radiation Effects Report |
| RER | Rare Earth Research |