/ Dictionary / Index C cleistothecium: Meaning and Definition of Find definitions for: cleis•to•the•ci•um Pronunciation: (klī"stu-thē'shē-um, -sē-um), [key] — pl. -ci•a (in certain ascomycetous fungi) a closed, globose ascocarp from which the ascospores are released only by its rupture or decay. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cleistothecium (Thesaurus) cleistogamous clem Related Content Daily Word Quiz: menagerie Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language