| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |
|---|---|
| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |
| PET | peak ejection time; polyethylene terphthalate; poor exercise tolerance; positron emission tomography... |
| EPR | early progressive resistance; electron paramagnetic resonance; electronic patient record; electrophr... |
| ER | efficiency ratio; epigastric region; ejection rate; electroresection; emergency room; endoplasmic re... |