/ Dictionary / Index T thalamencephalon: Meaning and Definition of Find definitions for: thal•a•men•ceph•a•lon Pronunciation: (thal"u-men-sef'u-lon", -lun), [key] — pl. -lons, -la the diencephalon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Thakur thalamium Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language