Short answer: D#M7b9 is a D# Major 7♭9 chord with the notes D♯, F♯♯, A♯, C♯♯, E. In D maj tuning, there are 2 voicings. See the fingering diagrams below.
Also known as: D#Ma7b9, D#Δ7b9, D#Δb9
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