Definition of rotameter in US English:

rotameter

noun

  • 1An apparatus for demonstrating the circular motion of the planets. rare. Now historical.

  • 2= rotometer. Now rare.

  • 3Also with capital initial. A device with a transparent wall that can be fitted into a pipe or tube to indicate the rate of flow of fluid passing along it. [A trademark in the United Kingdom.]

Origin

Late 19th century; earliest use found in Nature: a weekly journal of science. From rota- + -meter.

Pronunciation

rotameter

/ˌrəʊˈtamɪtə/