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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Tach·o·graph n.  A recording or registering tachometer; also, its autographic record.
 

From: WordNet (r) 2.0

 tachograph
      n : a tachometer that produces a graphical record of its
          readings; used to record the speed and duration of trips
          in a motor vehicle