| IO | incisal opening; inferior oblique; inferior olive; internal os; interorbital; intestinal obstruction... |
|---|---|
| KOC | cathodal opening contraction |
| Mo | mitral opening |
| MVO | maximum venous outflow; mitral valve opening or orifice |
| OP | occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pre... |