velocimeter

velocimeter

[vee-loh-sim-uh-ter, vel-oh-]
noun
any of various instruments for measuring velocity, as of a wave in water or of sound in air.

Origin:
1842; veloci(ty) + -meter

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
velocimeter   (vē'lō-sĭm'ĭ-tər, věl'ō-)  Pronunciation Key 
A device that utilizes the Doppler effect to measure the speed of sound in water. Developed by the US Army Corps of Engineers, a velocimeter transmits a pulse of sound through water and measures its echo for changes in either pitch or frequency. Oceanographers employ velocimeters to study the interior structure of breaking waves; they are also used in hydraulic engineering and to study fluid flow.
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