n, pl  -phies  1  :  the act or process of making an X-ray photograph of the ventricles of the brain after withdrawing fluid from the ventricles and replacing it with air or a radiopaque substance  2  :  the act or process of making an X-ray photograph of a ventricle of the heart after injecting a radiopaque substance ven*tric*u*lo*graph*ic adj 
 
 
 
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