Atrioventricular Definition
 ātrē-ō-vĕn-trĭkyə-lər 
    adjective
  
 Of, relating to, or involving the atria and the ventricles of the heart.
 American Heritage 
Of or having to do with an atrium and a ventricle of the heart.
 Webster's New World 
Relating to or involving the atria and the ventricles of the heart.
 American Heritage Medicine 
Of the spatial relationship between the ventricles and the atria of the heart.
Wiktionary 
Synonyms: 
  - auriculoventricular
 
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