(a.) Cleft or separated into eight segments, as a calyx.

contraoctave double contraoctave eightfold four-foot octave four-line octave great octave octadic octagonal octahedral octal octan octaploid octastyle octave octofid octonary octosyllabic octuple one-line octave ottava ottava alta ottava bassa small octave subcontraoctave tone row two-foot octave two-line octave