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paleoencephalon

[pey-lee-oh-en-sef-uh-lon; especially British pal-ee-]
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noun, plural pa·le·o·en·ceph·a·la [pey-lee-oh-en-sef-uh-luh; especially British pal-ee-] /ˌpeɪ li oʊ ɛnˈsɛf ə lə; especially British ˌpæl i-/.
  1. paleencephalon.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018