| ORBC | ox red blood cell |
|---|---|
| ORO | oil red O |
| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |
| PRBC | packed red blood cells; placental residual blood volume |
| PRC | packed red cells; peer review committee; phase response curve; plasma renin concentration; professio... |