atrioventricular
Concise Oxford English Dictionary © 2008 Oxford University Press:
atrioventricular /ˌeɪtrɪə(ʊ)vɛnˈtrɪkjʊlə/
▶adjective Anatomy & Physiology relating to the atrial and ventricular chambers of the heart.
'atrioventricular' also found in these Oxford entries:

