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[nee-en-sef-uh-lon, -luh n]
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noun, plural ne·en·ceph·a·lons, ne·en·ceph·a·la [nee-en-sef-uh-luh] /ˌni ɛnˈsɛf ə lə/.
  1. the more recent part of the brain in the evolutionary development of animals, including the cerebral cortex and its related structures.
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Origin of neencephalon

First recorded in 1915–20; ne- + encephalon
Related formsne·en·ce·phal·ic [nee-en-suh-fal-ik] /ˌni ɛn səˈfæl ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018