| PPD | packs per day; paraphenylenediamine; percussion and postural drainage; permanent partial disability;... |
|---|---|
| SD | Sandhoff disease; senile dementia; septal defect; serologically defined; serologically detectable; s... |
| TAPVD | total anomalous pulmonary venous drainage |
| TDD | telecommunication device for the deaf; tetradecadiene; thoracic duct drainage; total digitalizing do... |
| PNL | Percutaneous Nephro-Lithotomy(= -Litholapaxy, = -Lithotripsy) |