/ Dictionary / Index P powerboat: Meaning and Definition of Find definitions for: pow•er•boat Pronunciation: (pou'ur-bōt"), [key] — n. a boat propelled by mechanical power. motorboat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: powerboat (Thesaurus) power base powerboater 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