/ Dictionary / Index A aethalium: Meaning and Definition of Find definitions for: ae•tha•li•um Pronunciation: (ē-thā'lē-um), [key] — pl. -li•a a large, plump, pillow-shaped fruiting body of certain myxomycetes, formed by the aggregation of plasmodia into a single functional mass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. aetatis suae* aetheling Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language