What does dynamometer mean?
A dynamometer is a precision instrument used to measure force, torque, or power. Its best-known application is in engineering, where engines, motors, and drivetrains are mounted on a dynamometer — often shortened to 'dyno' — so their output can be measured under controlled, repeatable conditions rather than on the open road. Brake dynamometers absorb the power produced by an engine, while chassis dynamometers let a vehicle's wheels turn against rollers to simulate driving loads. The word also appears in medicine and sports science, where handgrip dynamometers quantify muscle strength for diagnosis and training assessment. Because its readings are objective and reproducible, the dynamometer carries connotations of rigor and technical credibility: claims about horsepower or human strength are generally only taken seriously when they come from one. Though unfamiliar outside technical circles, the word is straightforward once encountered, combining the Greek roots for 'force' and 'measure'. It remains essential wherever performance must be verified rather than merely asserted.
nounAn instrument that measures force, torque, or power output, especially the mechanical power of an engine or motor.
- An instrument for measuring mechanical force or power, especially an engine's output on a test bench (a brake or engine dynamometer).
- A device measuring muscular strength in medicine and sports science (a handgrip dynamometer).
"The engine was strapped to a dynamometer to measure its horsepower under load."
"The prototype motor delivered 210 kilowatts when tested on the laboratory's chassis dynamometer."
"The physiotherapist recorded her grip strength using a handgrip dynamometer."
Standard regular plural.
"The workshop has two dynamometers for engine testing."
Every horsepower figure a carmaker brags about was measured by strapping the engine to a dynamometer and making it fight a controlled resistance.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dynamometer
The word comes from Greek dynamis meaning 'force' or 'power', combined with the suffix -meter from metron, 'measure'. It entered English in the early 19th century as scientists sought precise ways to quantify the output of steam engines. It shares its root with related coinages such as dynamic, dynamics, and dynamo, all built on dynamis.
How dynamometer is actually used
Technical register, used mainly in engineering, automotive testing, and sports science. In everyday speech it is rare; people usually say 'on the dyno' in automotive contexts.
Easily confused with dynamometer
Dynamite is an explosive; a dynamometer is a measuring instrument for force or power.