volt-meter

voltmeter

[vohlt-mee-ter]
noun Electricity.
a calibrated instrument for measuring the potential difference between two points.

Origin:
1880–85; volt1 + -meter

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Collins
World English Dictionary
voltmeter (ˈvəʊltˌmiːtə)
 
n
an instrument for measuring potential difference or electromotive force

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
voltmeter   (vōlt'mē'tər)  Pronunciation Key 
An instrument used for measuring the difference in voltage between two points in an electric circuit. Voltmeters typically make use of an ammeter that measures current flow across a known resistance inside the voltmeter; direct-current voltages can then be determined by Ohm's law. Digital voltmeters employ A/D converters to provide the numerical value of the voltage displayed. Compare ohmmeter.
The American Heritage® Science Dictionary
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