/ Dictionary / Index A archegonium: Meaning and Definition of Find definitions for: ar•che•go•ni•um Pronunciation: (är"ki-gō'nē-um), [key] — pl. -ni•a the female reproductive organ in ferns, mosses, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: archegonium (Thesaurus) arched truss Archemorus Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language