tach ‧ o ‧ graph /ˈtækəɡrɑːf $ -ɡræf/ BrE AmE noun [countable] technical
a piece of equipment for recording the speed of a vehicle, the distance it has travelled etc
tach ‧ o ‧ graph /ˈtækəɡrɑːf $ -ɡræf/ BrE AmE noun [countable] technical
a piece of equipment for recording the speed of a vehicle, the distance it has travelled etc
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012