You searched for:
“quadriphonics”
quadriphonic, quadriphonics, quadrophonic
All of these are variations in form of quadraphonic, et al.
This entry is located in the following units:
phon-, phono-, -phone, -phonia, -phonic, -phonetic, -phonous, -phonically, -phonetically, -phony +
(page 17)
quadri-, quadra-, quad-, quadru-
(page 3)