Half-diminished seventh chord - Wikipedia
https://en.wikipedia.org/wiki/Half-diminished_seventh_chord
WEBIn music theory, the half-diminished seventh chord (also known as a half-diminished chord or a minor seventh flat five chord) is a seventh chord composed of a root note, together with a minor third, a diminished fifth, and a minor seventh (1, ♭ 3, ♭ 5, ♭ 7).
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