One of the mysteries of the English language finally explained.
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.]
Late 19th century; earliest use found in Nature: a weekly journal of science. From rota- + -meter.
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