periphonic (?p?r??f?n?k) adj (Electronics) electronics (of sound reproduction) involving speakers placed at different heights so as to produce sound from all directionsCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014