Definition of rhysimeter in US English:

rhysimeter

noun

rare
  • An instrument for measuring the speed of flow of water or the speed of a ship through water, comprising an open-ended tube positioned in opposition to the flow and connected to a column of mercury or other liquid, which is raised by the pressure of the water.

Origin

Late 19th century. From ancient Greek ῥύσις flow, stream + -meter.

Pronunciation

rhysimeter

/rɪˈsɪmɪtə/