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quadraphonic (adj.)
1969, irregular formation from quadri- "four" + phonic, from Greek phone "sound, voice," from PIE root *bha- (2) "to speak, tell, say." The goal was to reproduce front-to-back sound distribution in addition to side-to-side stereo. The later term for the same idea, surround sound, is preferable to this.
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Definitions of quadraphonic from WordNet
Dictionary entries near quadraphonic
quad
Quadragesima
quadrangle
quadrangular
quadrant
quadraphonic
quadrat
quadratic
quadratus
quadrennial
quadri-