[ pey-lee-en-sef-uh-lon; especially British pal-ee- ]
/ ˌpeɪ li ɛnˈsɛf əˌlɒn; especially British ˌpæl i- /
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.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020