| MRU | mass radiography unit; minimal reproductive unit |
|---|---|
| PFU | plaque-forming unit; pock-forming unit |
| PICU | pediatric intensive care unit; pulmonary intensive care unit |
| PSU | photosynthetic unit; primary sampling unit |
| PU | palindromic unit; passed urine; pepsin unit; peptic ulcer; pregnancy urine; 6-propyluracil; prostati... |