Nouns

(n)stereo, stereophony, stereo system, stereophonic systemreproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound
(n)stereo, stereoscopic picture, stereoscopic photographtwo photographs taken from slightly different angles that appear three-dimensional when viewed together

Adjectives

(s)stereophonic, stereo, two-channeldesignating the reproduction of sound using two or more independent audio channels