| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |
|---|---|
| OHS | Open Heart Surgery |
| OR | 1) Operating Room; 수술실 2) Open Reduction |
| O/R | Open Reduction |
| BOR | basal optic root; before time of operation; bowels open regularly; branchio-oto-renal [syndrome] |