| PSD | Posterior Sagital Distance |
|---|---|
| PSD | particle size distribution; peptone, starch, and dextrose; periodic synchronous discharge; phase-sensitive detector; poststenosis dilation; postsynaptic density; power spectrum density |
| PSDA | Patient Self-Determination Act; psychoactive substance abuse and dependence |
| PSDES | primary symptomatic diffuse esophageal spasm |