tachometer

[ ta-kom-i-ter, tuh- ]

noun

1. any of various instruments for measuring or indicating velocity or speed, as of a machine, a river, or the blood.
2. an instrument measuring revolutions per minute, as of an engine.

tachometer

/ ˌtækəˈmɛtrɪk; tæˈkɒmɪtə /

noun

1. any device for measuring speed, esp the rate of revolution of a shaft. Tachometers (rev counters) are often fitted to cars to indicate the number of revolutions per minute of the engine

Derived Forms

• taˈchometry, noun
• tachometric, adjective
• ˌtachoˈmetrically, adverb

Other Words From

• tach·o·met·ri·cal·ly [tak-, uh, -, me, -trik-lee], adverb
• ta·chome·try noun

Word History and Origins

Origin of tachometer¹

First recorded in 1800–10; tacho- + -meter

Example Sentences

It had been suggested that the revolutions in Africa occurred so often that only a tachometer could keep up with them.

From Project Gutenberg

His clock and his tachometer assured him that he was well past Easton.

From Project Gutenberg

He watched his tachometer, which indicated his revolutions per minute.

From Project Gutenberg

I guess the first thing that Lindy watched was the tachometer.

From Project Gutenberg

The engine was next started and the number of revolutions of the propellers counted by a tachometer.

From Project Gutenberg