electroscopic

electroscope

[ih-lek-truh-skohp]
noun
a device for detecting the presence and determining the sign of electric charges by means of electrostatic attraction and repulsion, often between two pieces of gold leaf enclosed in a glass-walled chamber.

Origin:
1815–25; electro- + -scope

electroscopic [ih-lek-truh-skop-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
electroscope (ɪˈlɛktrəʊˌskəʊp)
 
n
an apparatus for detecting an electric charge, typically consisting of a rod holding two gold foils that separate when a charge is applied
 
electroscopic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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