/ Dictionary / Index P perithecium: Meaning and Definition of Find definitions for: per•i•the•ci•um Pronunciation: (per"u-thē'shē-um, -sē-um), [key] — pl. -ci•a the fruiting body of ascomycetous fungi, typically a minute, more or less completely closed, globose or flask-shaped body enclosing the asci. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: perithecium (Thesaurus) peritectic perithelium Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language