| RFE | relative fluorescence efficiency |
|---|---|
| RGE | relative gas expansion |
| RGR | relative growth rate |
| RHD | radiological health data; relative hepatic dullness; renal hypertensive disease; rheumatic heart dis... |
| RI | radiation intensity; radioactive isotope; radioimmunology; recession index; recombinant inbred [stra... |