Tachometer

Alternative forms

• tachometre nonstandard

Origin

- + meter + -

Full definition of tachometer

Noun

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.

Synonyms

• (device for measuring velocity) speedometer

Related terms

• tachymeter