Definition of polyrhythmical in US English:

polyrhythmical

adjective

Music
  • Polyrhythmic.

Origin

Late 19th century; earliest use found in John Shedlock (1843–1919). From poly- + rhythmical. Compare German polyrhythmisch.

Pronunciation

polyrhythmical

/ˌpɒlɪˈrɪðmɪkl/