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|Noun||1.||septal defect - a congenital abnormality in the septum between the left and right sides of the heart|
congenital heart defect - a birth defect involving the heart
atrial septal defect - an abnormal opening between the left and right atria of the heart
ventricular septal defect - 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
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