/ Dictionary / Index S sidesplitter: Meaning and Definition of Find definitions for: side•split•ter Pronunciation: (sīd'split"ur), [key] — n. something that is uproariously funny, as a joke or a situation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sidesplitter (Thesaurus) sidespin sidesplitting Related Content Daily Word Quiz: ingenuity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language