/ Dictionary / Index M Megalesia: Meaning and Definition of Find definitions for: Meg•a•le•sia Pronunciation: (meg"u-lē'zhu, -shu, -sē-u), [key] — n. (sometimes used with a pl. v.) an ancient Roman festival in honor of the Magna Mater. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. megalecithal -megalia Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language