'Tachograph' definitions:
Definition of 'tachograph'
(from WordNet)
noun
A tachometer that produces a graphical record of its readings; used to record the speed and duration of trips in a motor vehicle
Definition of 'Tachograph'
From: GCIDE
- Tachograph \Tach"o*graph\, n. [Gr. ta`chos speed + -graph.] A recording or registering tachometer; also, its autographic record. [Webster 1913 Suppl.]