The D-flat half-diminished seventh chord (abbreviated "Dbm7(b5) chord") is a four-note chord consisting of the notes D♭, F♭, A♭♭, and C♭. The chord is formed by lowering the fifth of a D-flat minor seventh chord a half step.
D-flat half-diminished seventh chord
D-flat half-diminished chord D-flat minor seventh flat five chord
D♭ F♭ A♭♭ C♭
1 ♭3 ♭5 ♭7
D♭ø D♭ø7 D♭m7b5 D♭–7(b5) D♭mi7(b5) D♭min7(b5)
Tetrad (four-note chord)