het·er·oph·o·ny 
(hĕt′ə-rŏfə-nē)
(hĕt′ə-rŏfə-nē)n.
The simultaneous playing or singing of two or more versions of a melody.
het′er·o·phonic (-ər-ə-fŏnĭk) adj.
- ultramarathoner
- ultramarine
- ultramicrometer
- ultramicroscope
- ultramicroscopic
- ultramicroscopy
- ultramicrotome
- ultramicrotomy
- ultraminiature
- ultraminiaturization
- ultraminiaturize
- ultramodern
- ultramodernism
- ultramodernist
- ultramodernistic
- ultramontane
- ultramontanism
- ultramontanist
- ultramundane
- ultranational
- ultranationalism
- ultranationalist
- ultranationalistic
- ultrashort
- ultrasonic