/ Dictionary / Index P paleoencephalon: Meaning and Definition of Find definitions for: pa•le•o•en•ceph•a•lon Pronunciation: (pā"lē-ō-en-sef'u-lon" esp. Brit. pal"ē-), [key] — pl. -la paleencephalon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: paleoencephalon (Thesaurus) paleocortex paleog. Related Content Daily Word Quiz: prevalent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language