/ Dictionary / Index M megasporangium: Meaning and Definition of Find definitions for: meg•a•spo•ran•gi•um Pronunciation: (meg"u-spô-ran'jē-um, -spō-), [key] — pl. -gi•a a sporangium containing megaspores. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megasporangium (Thesaurus) megaron megaspore 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