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

DISDIAPASON Diapente, 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 $24 : 5$.