/ Dictionary / Index S sporangium: Meaning and Definition of Find definitions for: spo•ran•gi•um Pronunciation: (spu-ran'jē-um), [key] — pl. -gi•a the case or sac in which spores are produced. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sporangium (Thesaurus) sporangiospore spore Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language