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rotameter

[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.
Origin
partial translation of German Rotamesser (1911), equivalent to Rota(tion) rotation + Messer measurer, meter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rotameter

Rotameter

/ˈrəʊtəˌmiːtə/
noun
1.
trademark 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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