Word Origin for diaphony
Examples from the Web for diaphony
He called his system an “organum” or “diaphony,” and to sing according to his rules was called to “organize” or “organate.”Critical & Historical Essays|Edward MacDowell
This question appears to have led to the practice of what Hucbald called "diaphony."
He mentions organum and diaphony, and remarks that he finds the succession of fifths and fourths very tiresome.