/ Dictionary / Index T telencephalon: Meaning and Definition of Find definitions for: tel•en•ceph•a•lon Pronunciation: (tel"en-sef'u-lon", -lun), [key] — pl. -lons, -la the anterior section of the forebrain comprising the cerebrum and related structures. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: telencephalon (Thesaurus) telemotor teleo- Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language