ohmmeter

[ohm-mee-ter]
noun Electricity.
an instrument for measuring electric resistance in ohms.

Origin:
1895–1900; ohm + -meter

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Collins
World English Dictionary
ohmmeter (ˈəʊmˌmiːtə)
 
n
an instrument for measuring electrical resistance

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ohmmeter   (ōm'mē'tər)  Pronunciation Key 
An instrument used for direct measurement of the electrical resistance of a material or electronic component, usually in ohms. Ohmmeters typically use an ammeter to measure current through the material after it has been given some set voltage by the ohmmeter; the direct-current resistance of the sample can then be directly determined through Ohm's law. Compare voltmeter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

ohmmeter

instrument for measuring electrical resistance, which is expressed in ohms. In the simplest ohmmeters, the resistance to be measured may be connected to the instrument in parallel or in series. If in parallel (parallel ohmmeter), the instrument will draw more current as resistance increases. If in series (series ohmmeter), current will decrease as resistance rises. Ratio meters measure the ratio of the voltage across the resistance to the current flowing through it. For high resistances, the scale is usually graduated in megohms (106 ohms), and the instrument is called a megohmmeter, or "megger."

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Change the circuit and use the multimeter as voltmeter, ammeter, or ohmmeter.
If the special silver chloride battery in the blaster's ohmmeter is depleted it
  must be replaced with an identical battery.
Test bolted connections for high resistance using low-resistance ohmmeter.
Measure contact resistance when closed with an ohmmeter.
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