atrial septal defect
atrial septal defect n.
A defect in the interatrial septum of the heart, due to failure of the embryonic foramen to close normally.
congenital absence or loss of hair. atrichia a·trich·i·a (ā-trĭk’ē-ə, ə-trĭk’-) n. The congenital or acquired absence of hair. Also called atrichosis.
atrichous atrichous at·ri·chous (āt’rĭ-kəs) adj. Having no hair.
lying to under a trysail in heavy weather; .
atrio- atrio- pref. Atrium: atrioventricular.