/ Dictionary / Index A arcosolium: Meaning and Definition of Find definitions for: ar•co•so•li•um Pronunciation: (är"ku-sō'lē-um), [key] — pl. -li•a (in Roman catacombs) an arched recess for a sarcophagus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arcograph A.R.C.S. Related Content Daily Word Quiz: epoch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language