The Collaborative International Dictionary of English v.0.48:
Binaural \Bin*au"ral\, a. [Pref. bin- + aural.] Of or pertaining to, or used by, both ears. [1913 Webster]WordNet (r) 3.0 (2006):
binaural adj 1: relating to or having or hearing with two ears; "binaural hearing" [syn: binaural, biaural] [ant: monaural]