A compact half-diminished on the top strings — the ii of C minor.
Notes: D – G# – C – F · Formula: 1 – ♭3 – ♭5 – ♭7
Load D Half-Diminished (Dm7b5) onto an interactive fretboard, hear every note, and build it into a progression.
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A D Half-Diminished (Dm7b5) chord contains the notes D, G#, C, F. It is built from the half-diminished formula 1 - ♭3 - ♭5 - ♭7, with D as the root.
Because it's halfway between a minor 7th and a fully diminished 7th. It has the diminished triad (D-F-A♭) of a diminished chord, but its seventh is a minor 7th (C) rather than a diminished 7th. That single softened note is what makes it 'half' diminished.