am·me·ter

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

Origin:
1880–85; am(pere) + -meter

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
ammeter (ˈæmˌmiːtə) [Click for IPA pronunciation guide]
 
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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00:10
Ammeter is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
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   (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
Make resistance measurements using either the resistance bridge method, the voltmeter-ammeter method or a resistance meter.
As each item is connected, read and record the total leakage current indicated by the micro-ammeter.
Put the power source in series with an ammeter and a calibrated variable
  resistor.
Fifteen minutes after start-up, measure the current draw of the motors with
  ammeter and record the reading of the vacuum gage.
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