# tachometer

> English word · Noun · IPA /təˈkɒmətə(ɹ)/ · frequency rank #74,557

## Definitions
1. A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
2. A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.

## Etymology
From tacho- + -meter.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/tachometer