Noun
Locrian mode
(music) A mode whose scale is the same as a minor key with the second scale degree lowered by one half step, with the interval pattern (semitone - tone - tone - semitone - tone - tone - tone).
Starting on the note C, a Locrian mode produces a scale with the notes C, D♭, E♭, F, G♭, A♭, B♭, C.
The Locrian mode is traditionally considered theoretical rather than practical because the triad built on the first scale degree is diminished. Source: Internet
Locrian (VII) Locrian mode on B About this sound Play ( help · info ) Locrian is the seventh and final mode. Source: Internet
The Locrian mode contains the minor third but not the perfect fifth, so its root chord is diminished. Source: Internet