septum secundum
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to septum secundum: foramen ovale, foramen secundum
septum secundum
[′sep·təm si′kən·dəm] (embryology)
The second incomplete interatrial septum of the embryo, containing the foramen ovale; it develops to the right of the septum primum and fuses with it to form the adult interatrial septum.