| NPD | narcissistic personality disorder; natriuretic plasma dialysate; negative pressure device; Niemann-P... |
|---|---|
| PID | pain intensity difference [score]; pelvic inflammatory disease; photoionization detector; picture im... |
| PSD | particle size distribution; peptone, starch, and dextrose; periodic synchronous discharge; phase-sen... |
| TCD | tapetochoroidal dystrophy; T-cell depletion; thermal conductivity detector; tissue culture dose; tra... |
| UFD | ultrasonic flow detector; unilateral facet dislocation |