ammeter

[am-mee-ter]
noun Electricity.
an instrument for measuring current in amperes.

Origin:
1880–85; am(pere) + -meter

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ammeter (ˈæmˌmiːtə)
 
n
an instrument for measuring an electric current in amperes
 
[C19: am(pere) + -meter]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

ammeter
instrument for measuring the strength of electric currents, 1882, from am(pere) + meter.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ammeter  [%PREMIUM_LINK%]     (ām'mē'tər)  Pronunciation Key 
An instrument that measures the strength of an electric current, indicating it in amperes. Ammeters typically include a galvanometer; digital ammeters typically include A/D converters as well. Compare ohmmeter, voltmeter.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

ammeter

instrument for measuring either direct or alternating electric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.

Learn more about ammeter with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Put the power source in series with an ammeter and a calibrated variable
  resistor.
If an ammeter is not built into the power supply an ammeter should be wired
  into the circuit to monitor the current flow.
Monitor the current continuously using the ammeter to determine whether or not
  the connector circuit retains its conductance.
Change the circuit and use the multimeter as voltmeter, ammeter, or ohmmeter.
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