tachometer
/təˈkɒmətə(ɹ)/ noun
Forms tachometers tachometre
- noun A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
- noun A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.
Synonyms
Etymology
From tacho- + -meter.
Webster’s 1913
- noun An instrument for measuring the velocity, or indicating changes in the velocity, of a moving body or substance. Specifically: -- (a) An instrument for measuring the velocity of running water in a river or canal, consisting of a wheel with inclined vanes, which is turned by the current. The rotations of the wheel are recorded by clockwork.
Etymology [Gr. -meter: cf. F. tachomètre.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “tachometer”, CC BY-SA 4.0. Details