| ER | efficiency ratio; epigastric region; ejection rate; electroresection; emergency room; endoplasmic re... |
|---|---|
| ERV | equine rhinopneumonitis virus; expiratory reserve volume |
| FRC | Federal Radiation Council; frozen red cells; functional reserve capacity; functional residual capaci... |
| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |
| IRC | inspiratory reserve capacity; instantaneous resonance curve; International Red Cross; International ... |