fossa ovalis
noun
fossa oval·is
| \ -ō-ˈva-ləs
, -ˈvā-
, -ˈvä-
\
, -ˈvā-
, -ˈvä-
\
Medical Definition of fossa ovalis
1
: a depression in the septum between the right and left atria that marks the position of the foramen ovale in the fetus