decidua basalis
noun
decidua ba·sa·lis
| \ -bə-ˈsā-ləs
\
\
variants:
also decidua serotina \ -ˌser-ə-ˈtē-nə, -ˈtī-
\
\
Medical Definition of decidua basalis
: the part of the endometrium in the pregnant human female that participates with the chorion in the formation of the placenta