n :  any of the several arteries supplying the diaphragm:  a  :  either of two arising from the thoracic aorta and distributed over the upper surface of the diaphragm - called also superior phrenic artery   b  :  either of two that arise from the abdominal aorta either directly as separate arteries or from the celiac artery or a renal artery or from a common trunk originating in the abdominal aorta or the celiac artery and that supply the underside of the diaphragm and the adrenal glands - called also inferior phrenic artery  .
 
 
 
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