/ Dictionary / Index M Mithraeum: Meaning and Definition of Find definitions for: Mith•rae•um Pronunciation: (mi-thrē'um), [key] — pl. Mith•rae•a Mith•rae•ums. a temple of Mithras. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mither Mithraism Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language