The Collaborative International Dictionary of English v.0.48:

auriculoventricular \auriculoventricular\ adj. (Med.)
   relating to or affecting the atria and ventricles of the
   heart.

   Syn: atrioventricular.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

auriculoventricular
    adj 1: relating to or affecting the atria and ventricles of the
           heart; "atrioventricular disease" [syn:
           atrioventricular, auriculoventricular]