| PRD | partial reaction of degeneration; physician relations department; postradiation dysplasia |
|---|---|
| REEDS | retention of tears, ectrodactyly, ectodermal dysplasia, and strange hair, skin and teeth [syndrome] |
| RL | radial line; radiation laboratory; reduction level; renal dysplasia-limb defects [syndrome]; resisti... |
| RVD | relative vertebral density; right ventricular dysplasia |
| SCE | secretory carcinoma of the endometrium; sister chromatid exchange; split hand-cleft lip/palate ectod... |