/ Dictionary / Index S speedboat: Meaning and Definition of Find definitions for: speed•boat Pronunciation: (spēd'bōt"), [key] — n. a motorboat designed for high speeds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: speedboat (Thesaurus) speedball speedboating Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language