tacho /takˈō/ (informal)

A tachograph or tachometer

tacho- /tak-ō-, -ə-, -o-/

Denoting speed

tachˈogram noun

A record made by a tachograph

tachˈograph noun

1. A recording tachometer
2. A tachogram
3. An instrument fitted to commercial vehicles to record mileage, speed, number and location of stops, etc

tachomˈeter noun

1. A device showing speed of rotation
2. An instrument for measuring the velocity of machines or currents

tachometˈric or tachometˈrical adjective

tachomˈetry noun

• tracklessly
• tracklessness
• tracklessnesses
• trackman
• trackmen
• trackpad
• trackpads
• track record
• track records
• trackroad
• trackroads
• track rod
• track rods
• tracks
• track-scout
• track-scouts
• track shoe
• track shoes
• tracksuit
• tracksuits
• track-walker
• track-walkers
• trackway
• trackways
• tract