What is "blues scale"

n. (context music English) A minor hexatonic scale originating in the American musical genre blues, consisting of tonic, minor third, fourth, blue note, fifth, and minor seventh, in which notes, particularly the minor third, fourth, diminished fifth, and minor seventh may be bend. It can also be called the blues scale when distinguishing it from its only other functional mode the major blues scale.

The term blues scale refers to several different scales with differing numbers of pitches and related characteristics.