Is “Quadraphonic” a Scrabble word?
Yes
QUADRAPHONIC
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Quadraphonic
adjective
1.(of a sound system) Employing four independent channels or speakers.
Synonyms: quadrasonic