| RL | radial line; radiation laboratory; reduction level; renal dysplasia-limb defects [syndrome]; resisti... |
|---|---|
| RMC | reticular magnocellular [nucleus]; right middle cerebral [artery] |
| RN | radionuclide; red nucleus; Registered Nurse; registry number; residual nitrogen; reticular nucleus |
| TRN | tegmental reticular nucleus |