| PDT | photodynamic therapy; population doubling time |
|---|---|
| Pop | popliteal; population |
| POPLINE | Population Information Online |
| PP | diphosphate group; emphysema [pink puffers]; near point of accommodation [Lat. punctum proximum]; pa... |
| PS | pacemaker syndrome; paired stimulation; paradoxical sleep; paraspinal; parasympathetic; Parkinson sy... |