| PSD | particle size distribution; peptone, starch, and dextrose; periodic synchronous discharge; phase-sen... |
|---|---|
| SD | Sandhoff disease; senile dementia; septal defect; serologically defined; serologically detectable; s... |
| SPD | schizotypal personality disorder; sociopathic personality disorder; specific paroxysmal discharge; s... |
| TUD | total urethral discharge |
| UD | ulcerative dermatosis; ulnar deviation; undetermined; underdeveloped; unit dose; urethral dilatation... |