or Bisdiapason, in Music, a compound concord, described by Parran, in the quadruple ratio of $4:1$, or $8:2$.

DISDIAPASON Discente, a concord in a sextuple ratio of $1:6$.

DISDIAPASON Semi-Diapente, a compound concord in the proportion of $16:3$.

DISDIAPASON Ditone, a compound consonance in the proportion of $10:2$.

DISDIAPASON Semi-Ditone, a compound concord in the proportion of $24:5$.