| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
|---|---|
| RAT | repeat action tablet; rheumatoid arthritis test |
| ROAT | repeat open application test |
| SCR | Schick conversion rate; short consensus repeat; silicon-controlled rectifier; skin conductance respo... |
| TR | recovery time; rectal temperature; repetition time; residual tuberculin; terminal repeat; tetrazoliu... |