Definition of quadrasonic in US English:

quadrasonic

(also quadrosonic, quadrisonic)

adjective

Sound Recording
  • Quadraphonic.

Origin

1970s; earliest use found in Time. From quadri- + sonic. The forms quadrasonic and quadrosonic reflect reduction of the vowel of the second syllable.

Pronunciation

quadrasonic

/ˌkwɒdrəˈsɒnɪk/