/ Dictionary / Index A archesporium: Meaning and Definition of Find definitions for: ar•che•spo•ri•um Pronunciation: (ar"ku-spôr'ē-um, -spōr'-), [key] — pl. -spo•ri•a archespore. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: archesporium (Thesaurus) archespore archetto Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language