rotameter

American  

[roh-tam-i-ter, roh-tuh-mee-] / roʊˈtæm ɪ tər, ˈroʊ təˌmi- /

noun

1. an instrument for measuring the rate of flow of a liquid, consisting of a tapered vertical tube in which a small float is forced upward until its weight balances the fluid force.

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Rotameter British  

/ ˈrəʊtəˌmiːtə /

noun

1. a device used for measuring the flow of a fluid. It consists of a small float supported in a tapering glass by the flow of the fluid, the height of the float indicating the rate of flow

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Etymology

Origin of rotameter

Partial translation of German Rotamesser (1911), equivalent to Rota ( tion ) rotation + Messer measurer, meter