A minor eleventh chord is created by adding an 11th degree to any minor 9th chord. For example, a Cm11 chord contains the notes C, Eb, G, Bb, D and F (1, b3, 5, b7, 9 and 11). Here are some common open minor 11th chord shapes.
Cm11
Dbm11
Dm11
Ebm11
Em11
F#m11
Bm11
Fm11
Gm11
Abm11
Am11
Bbm11