septal : Idioms & Phrases
atrial septal defect
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noun an abnormal opening between the left and right atria of the heart
WordNet
septal defect
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noun a congenital abnormality in the septum between the left and right sides of the heart
WordNet
ventricular septal defect
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noun a common congenital heart defect; an abnormal opening in the septum dividing the ventricles allows blood to pass directly from the left to the right ventricle; large openings may cause congestive heart failure