/ Dictionary / Index T tachograph: Meaning and Definition of Find definitions for: tach•o•graph Pronunciation: (tak'u-graf", -gräf"), [key] — n. a recording tachometer. tachogram. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tachograph (Thesaurus) tachogram tachometer Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language