/ Dictionary / Index S sphaeristerium: Meaning and Definition of Find definitions for: sphae•ris•te•ri•um Pronunciation: (sfēr"u-stēr'ē-um), [key] — pl. sphae•ris•te•ri•a an ancient Roman handball court. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sp. gr. sphaero- Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language