| PDT | photodynamic therapy; population doubling time |
|---|---|
| Pop | popliteal; population |
| POPLINE | Population Information Online |
| PS | pacemaker syndrome; paired stimulation; paradoxical sleep; paraspinal; parasympathetic; Parkinson sy... |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |