| RED | radiation experience data; rapid erythrocyte degeneration |
|---|---|
| SACD | subacute combined degeneration |
| SDC | serum digoxin concentration; Smith delay compensator; sodium deoxycholate; subacute combined degener... |
| SDSEM | spinocerebellar degeneration-slow eye movements [syndrome] |
| SMCD | senile macular choroidal degeneration; systemic mast cell disease; systemic meningococcal disease |