/ Dictionary / Index E epithalamus: Meaning and Definition of Find definitions for: ep•i•thal•a•mus Pronunciation: (ep"u-thal'u-mus), [key] — pl. -mi the dorsal area of the diencephalon containing a habenula and the pineal gland. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. epithalamium epithecium Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language