bisdiapason
nounIn music, a compound concord in the quadruple ratio of 4:1 or 8:2. Disdiapason diapente, a cocord in a sectuple ratio of 1:6. Disdiapason semi-diapente, a compound concord in the proportion of 16:3. Disdiapason ditone, a compound consontance in the proportion of 10:2. Disdiapason semi-ditone, a compound concord in the proportion of 24:5.