/ Dictionary / Index S speeder: Meaning and Definition of Find definitions for: speed•er Pronunciation: (spē'dur), [key] — n. a person or thing that speeds. a driver who exceeds the legal speed limit. a small self-propelled railroad car powered by a gasoline engine and used by section hands. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: speeder (Thesaurus) speed demon speed freak Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language