Definition of tachograph noun from the Oxford Advanced Learner's Dictionary

 

tachograph

 noun
noun
BrE BrE//ˈtækəɡrɑːf//
 
; NAmE NAmE//ˈtækəɡræf//
 
 
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a device that is used in vehicles such as large lorries/trucks and some types of buses to measure their speed, how far they have travelled and when the driver has stopped to rest
See the Oxford Advanced American Dictionary entry: tachograph