Cdim7 chord
The C diminished seventh chord (abbreviated "Cdim7 chord") is a four-note chord consisting of the notes C, E♭, G♭, and B♭♭. The chord is formed by adding a diminished seventh to a C diminished chord.
Name
C diminished seventh chord
Synonym
C fully diminished chord
Notes
C E♭ G♭ B♭♭
Intervals
1 ♭3 ♭5 ♭♭7
Chord symbol
Co7
Alternative symbols
Cdim7 Cdim Co
Type
Tetrad (four-note chord)