Pronunciation: (pā"lē-en-sef'u-lon"; esp. Brit. pal"ē-), [key]
—pl. -laPronunciation: (-lu). [key]
(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. Also,paleoencephalon.Cf. neencephalon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.