The D-sharp half-diminished seventh chord (abbreviated "D#m7(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-sharp minor seventh chord a half step.
D-sharp half-diminished seventh chord
D-sharp half-diminished chord D-sharp 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)