bin·au·ral (bī-nôrəl, bĭn-ôr-)
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.
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.