/ Dictionary / Index A aecium: Meaning and Definition of Find definitions for: ae•ci•um Pronunciation: (ē'sē-um, ē'shē-), [key] — pl. ae•ci•a the fruiting body of rust fungi, which bears chainlike or stalked spores. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aecium (Thesaurus) aeciospore A.Ed. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language