WordNet sense 1 (two photographs taken from slightly different angles that appear three-dimensional when viewed together):

stereoscopic photograph, stereoscopic picture

WordNet sense 2 (reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound):

stereophonic system, stereophony, stereo system

WordNet sense 3 (designating sound transmission from two sources through two channels):

stereophonic, two-channel

WordNet sense 4 (relating to or having or hearing with two ears):

biaural, binaural