/ Dictionary / Index S sponson: Meaning and Definition of Find definitions for: spon•son Pronunciation: (spon'sun), [key] — n. a structure projecting from the side or main deck of a vessel to support a gun or the outer edge of a paddle box. a buoyant appendage at the gunwale of a canoe to resist capsizing. a protuberance at the side of a flying-boat hull, designed to increase lateral stability in the water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sponsion sponsor Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language