chord consisting of the first, flatted third, and flatted fifth of a major scale

a dissonant, "double-flatted" musical chord

a minor chord with a lowered fifth

a minor chord with a loweredfifth

A chord consisting of a minor third and a diminished fifth. For example, a D diminished chord (D?) contains D, F, and Ab.

Generally, in music, a diminished chord is a chord which has a diminished fifth in it. More specifically, it is a three-note chord (a diminished triad) consisting of a minor third and diminished fifth above the root - if built on C, a diminished chord would have a C, an E flat and a G flat. The interval between the upper two notes is also a minor third - thus, the chord consists of two minor thirds stacked on top of one another.