[pey-lee-en-sef-uh-lon; especially British pal-ee-]

noun, plural pa·le·en·ceph·a·la [pey-lee-en-sef-uh-luh; especially British pal-ee-] /ˌpeɪ li ɛnˈsɛf ə lə; especially British ˌpæl i-/.

(no longer in technical use) the more primitive part of the brain in the evolutionary development of animals, including all parts except the cerebral cortex and its related structures.

Compare neencephalon.

Origin of paleencephalon

From New Latin, dating back to 1915–20; see origin at pale-, encephalon Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019