bin·au·ral 
(bī-nôrəl, bĭn-ôr-)
(bī-nôrəl, bĭn-ôr-)adj.
1.
a. Having or relating to two ears.
b. Having to do with the perception of sound with both ears: binaural hearing.
2. Of or relating to sound transmission from two sources, which may vary acoustically, as in tone or pitch, to give a stereophonic effect.
bin·aural·ly adv.