It is "dextromanual" while having a dominant right foot is "dextropedal."
This obviously correlates to chemistry where The right side of molecules are the dextrorotary and left are levorotary. Applying this, I thought, logically, left-handed persons would be "levomanual" but could find nothing. I also tried"adextromanual" but also a dead end. Left-handed bias I suppose?
But yes, right-handedness is, indeed, "dextromanual."