| PAA | partial agonist activity; phenylacetic acid; phosphonoacetic acid; physical abilities analysis; plas... |
|---|---|
| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |
| IHSS(= HCMP) | Idiopathic Hypertrophic Subaortic Stenosis = Obstructive Idiopathic Hypertrophic Car... |
| ORA | opiate receptor agonist |
| PaO2 | partial oxygen tension in arterial blood; partial pressure of oxygen in arterial blood |