paleopallium
noun
pa·leo·pal·li·um
variants:
or British palaeopallium \ -ˈpal-ē-əm 
\
\
plural paleopallia\ -ē-ə
\
or paleopalliums
\
or paleopalliums
Medical Definition of paleopallium
: a phylogenetically old part of the cerebral cortex that develops along the lateral aspect of the hemispheres and gives rise to the olfactory lobes in higher forms