| PN2 | partial pressure of nitrogen |
|---|---|
| PND | paroxysmal nocturnal dyspnea; partial neck dissection; postnasal drainage; postnasal drip; postnatal... |
| PNS | paraneoplastic syndrome; parasympathetic nervous system; partial nonprogressive stroke; peripheral n... |
| PNT | partial nodular transformation; patient |
| PO2, | PO2, pO2 partial pressure of oxygen |