/ Dictionary / Index S speedo: Meaning and Definition of Find definitions for: speed•o Pronunciation: (spē'dō), [key] — pl. speed•os. speedometer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. speed metal speedometer Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language