| BOR | basal optic root; before time of operation; bowels open regularly; branchio-oto-renal [syndrome] |
|---|---|
| HAZWOPER | Hazardous Waste Operation and Emergency Response [of OSHA] |
| OP | occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pre... |
| op | operation; operator |
| SPOOL | simultaneous peripheral operation on-line |