ATRIAL SEPTAL DEFECT

 I. (noun) 

Sense 1

Meaning:

An abnormal opening between the left and right atria of the heart

Classified under:

Nouns denoting stable states of affairs

Hypernyms ("atrial septal defect" is a kind of...):

septal defect (a congenital abnormality in the septum between the left and right sides of the heart)

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